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COMMUNITY MEDICINE - PAPER II: MODEL ANSWERS

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SECTION B - LONG ESSAYS

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Q1. A 10-week Primigravida with Cough & Fever - NTEP Diagnostic Algorithm, Case Management & TB Preventive Therapy (2+3+3+2 = 10 Marks)

Diagnostic Algorithm under NTEP

• If the first smear is positive and patient is not at risk for DR-TB → categorized as microscopically confirmed TB (sensitivity status not known) → treat as DS-TB.
• If the first smear is negative → Chest X-ray (CXR) is done:
  • If CXR is suggestive of TB → 2nd sample subjected to smear AND CBNAAT simultaneously.
  • If CBNAAT is positive with Rifampicin Sensitive → Drug Sensitive TB confirmed.
  • If CBNAAT shows Rifampicin Resistant → Drug Resistant TB.

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a) Case Management: Drug Sensitive TB (DS-TB) in Pregnancy

• Streptomycin is contraindicated in pregnancy (ototoxic to fetus).
• Ethambutol replaces streptomycin - safe in pregnancy.
• Pyrazinamide is used despite it being controversial in some old guidelines; under current NTEP it is included in pregnant women.
• Pyridoxine (Vitamin B6) 10 mg/day is given alongside INH to prevent peripheral neuropathy.
• HIV testing mandatory; if HIV positive → also start ART.
• Pre-treatment evaluation: CBC, blood sugar, LFT, renal function, CXR, pregnancy test, urine examination.

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b) Case Management: Drug Resistant TB (DR-TB) in Pregnancy

• Newer drugs like Bedaquiline (Bdq) and Delamanid (Dlm) may be used under expert consultation.
• Kanamycin/Amikacin are contraindicated (ototoxic to fetus) - use caution.
• All MDR-TB patients receive DOT provider support.
• Mandatory counselling, including family planning advice for female patients.
• All MDR-TB cases are offered HIV testing and counselling.
• Nikshay entry must be done at treatment initiation.

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TB Preventive Therapy (TPT)

1. All asymptomatic contacts under 6 years of a smear-positive TB case, after ruling out active disease (regardless of BCG or nutritional status).
2. All HIV-infected children with known exposure to TB case OR TST positive (≥5 mm induration) but no active TB.
3. All TST-positive children on immunosuppressive therapy (nephrotic syndrome, acute leukemia, etc.).
4. A child born to a mother diagnosed with TB during pregnancy - receives 6 months prophylaxis after ruling out congenital TB, then BCG vaccination.

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Q2. MCH Indicators + Maternal Mortality Causes & Prevention (1+3+6 = 10 Marks)

Indicators of MCH Care

1. Maternal Mortality Ratio (MMR)
2. Perinatal Mortality Rate
3. Neonatal Mortality Rate
4. Post-neonatal Mortality Rate
5. Infant Mortality Rate (IMR)
6. 1-4 year mortality rate
7. Under-5 Mortality Rate (U5MR)
8. Child Survival Rate

• Low birth weight rate (<2500 g at birth)
• Nutritional status indicators (anaemia in pregnant women, prevalence of stunting, wasting, underweight in children)
• Percentage of deliveries by trained personnel
• Percentage of institutional deliveries

• Antenatal care coverage (≥4 ANC visits)
• Percentage of mothers receiving full ANC
• Immunization coverage (BCG, DPT, OPV, measles)
• Contraceptive prevalence rate

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Causes of Maternal Mortality in India

1. Haemorrhage - commonest cause (antepartum/postpartum)
2. Sepsis/Infection - particularly following unsafe abortion or delivery
3. Eclampsia/Pre-eclampsia (toxaemia of pregnancy)
4. Obstructed/prolonged labour
5. Unsafe abortion complications
6. Ectopic pregnancy
7. Anaemia (indirect aggravating cause)

• Tuberculosis, malaria, cardiac disease, diabetes aggravated by pregnancy

1. Delay in deciding to seek care
2. Delay in reaching care
3. Delay in receiving care

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Preventive Measures for Maternal Mortality

1. Early registration of pregnancy
2. At least four antenatal check-ups
3. Dietary supplementation, including correction of anaemia (IFA tablets)
4. Prevention of infection and haemorrhage during puerperium
5. Prevention of complications - eclampsia, malpresentations, ruptured uterus
6. Treatment of medical conditions - hypertension, diabetes, TB
7. Anti-malaria and tetanus prophylaxis (TT vaccination)
8. Clean delivery practices / aseptic techniques
9. In India - trained village level health workers (ASHAs, ANMs) can prevent many deaths
10. Institutional deliveries for women with bad obstetric history and risk factors (JSY incentive scheme)
11. Promotion of family planning - spacing of births, limiting to 2 children
12. Identification of every maternal death and maternal death review
13. Safe abortion services (MTP Act 1971 amended 2021)

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SECTION B - SHORT ESSAYS

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Q3. Risk Factors of CHD and Its Prevention (2+3 = 5 Marks)

Risk Factors of Coronary Heart Disease

1. Elevated blood cholesterol (hypercholesterolaemia) - LDL is most directly associated with CHD. HDL is protective (should be >40 mg/dL). Total cholesterol/HDL ratio <3.5 is the goal.
2. Hypertension - Even a small reduction of 2-3 mmHg in mean population BP produces large reduction in CVD complications.
3. Cigarette smoking - Direct independent risk factor; promotes atherosclerosis and thrombosis.
4. Sedentary lifestyle / Physical inactivity - Associated with early CHD; regular exercise increases HDL and decreases BP.
5. Diabetes mellitus - Risk of CHD is 2-3 times higher in diabetics than non-diabetics.
6. Obesity

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Prevention of CHD

1. Dietary changes: Reduce total fat to 20-30% of energy; saturated fat <10%; dietary cholesterol <100 mg/1000 kcal; increase complex carbohydrates; reduce salt to ≤5 g/day; avoid alcohol.
2. Anti-smoking: Achieve smoke-free society; legislation, health education, fiscal measures, cessation programmes.
3. Blood pressure control: Prudent diet (reduced salt, avoid alcohol), regular physical activity, weight control.
4. Regular physical activity: Important from childhood; reduces risk significantly.

• Identify high-risk individuals via screening (lipid profile, BP screening).
• Intensive intervention with drugs (statins, antihypertensives) + lifestyle modification.

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Q4. ICTC, PPTCT - Components of Counselling & HIV Testing in India (1+4 = 5 Marks)

ICTC - Integrated Counselling and Testing Centre

1. Integrated Counselling and Testing Centres (ICTC)
2. Prevention of Parent-to-Child Transmission (PPTCT)
3. HIV/TB collaborative activities

• (i) Standalone ICTC (SA-ICTC): High client load; full-time counsellor and lab technician; located at medical colleges, district hospitals, CHCs.
• (ii) Facility-Integrated ICTC (F-ICTC): Set up at 24×7 PHC level below block; existing staff trained; PPP-ICTCs in private facilities also established.

• Van with facility for examination, counselling, and blood sample collection/processing.
• Team: Health educator/ANM + counsellor + lab technician.
• Serves hard-to-reach areas with flexible hours.

• Early detection of HIV
• Provision of basic information on modes of transmission and prevention
• Promoting behavioural change and reducing vulnerability
• Linking PLHIV to prevention, care, and treatment services

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PPTCT - Prevention of Parent-to-Child Transmission

1. Routine offer of HIV counselling and testing to all pregnant women in ANC with 'opt-out' option
2. Involvement of spouse and family; move from ANC-centric to Family-Centric approach
3. Life-long ART (TDF+3TC+EFV - Triple drug regimen) to all HIV-infected pregnant and breastfeeding women regardless of CD4 count (Option B+)
4. Promotion of institutional deliveries for HIV-infected pregnant women
5. Provision of care for associated conditions (STI/RTI, TB, opportunistic infections)
6. Nutrition, counselling, and psychosocial support
7. Counselling for exclusive breastfeeding within 1 hour of delivery for 6 months
8. ARV prophylaxis to infants from birth for minimum 6 months
9. Integration of follow-up of HIV-exposed infants into routine healthcare (immunization)
10. Co-trimoxazole prophylaxis (CPT) and Early Infant Diagnosis (EID) using HIV-DNA PCR at 6 weeks of age onwards
11. Strengthening community follow-up through local community networks

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Q5. Demographic Cycle - Definition & Stages (2+3 = 5 Marks)

Demographic Cycle (Demographic Transition)

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Stages of Demographic Cycle

• Both birth rate and death rate are high (35-40/1000)
• Population remains stationary (no significant growth)
• High fertility offset by high mortality
• Seen in primitive/pre-industrial societies
• Life expectancy low

• Death rate begins to fall rapidly (due to improvements in sanitation, nutrition, medicine)
• Birth rate remains high
• Population expands rapidly (population explosion)
• India was in this stage in early decades post-independence

• Death rate continues to fall and reaches low levels
• Birth rate also begins to fall gradually
• Population still grows but at a slower rate
• Declining family size as urbanization and education rise

• Both birth rate and death rate are low (15/1000 or less)
• Population is again stationary but at a high level
• Characteristic of industrialized/developed nations

• Birth rate falls below death rate
• Population begins to decline (negative growth)
• Seen in some European nations (e.g., Germany, Sweden)

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Q6. Eligible Couples, Target Couples & Barrier Methods of Contraception (1+4 = 5 Marks)

Eligible Couples

Target Couples

• The wife is in the 15-44 years age group
• The couple does not wish to have any more children OR wants to space births
• They are considered a priority for family planning services

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Barrier Methods of Contraception

1. Condom (Male condom):
   • Contraceptive efficiency: 85-98% (Pearl index: 2-15 per HWY)
   • Protects against STIs/HIV
   • No systemic effects; easily available
   • Dual protection: contraception + STI prevention
   • Made of latex/polyurethane
2. Diaphragm:
   • Dome-shaped rubber device inserted into vagina to cover cervix
   • Must be used with spermicidal cream/jelly
   • Inserted 6 hours before intercourse; left in place for 6 hours after
   • Efficiency: ~85%
3. Cervical Cap:
   • Smaller thimble-shaped device fitting over cervix
   • Used with spermicide
   • Can be left in place longer than diaphragm

1. Female Condom:
   • Polyurethane pouch lining vagina
   • Provides protection against STIs
   • Can be inserted up to 8 hours before intercourse
2. Spermicides:
   • Chemical agents (nonoxynol-9) that kill sperms
   • Available as creams, jellies, foams, suppositories
   • Used alone or with barrier methods

• No systemic side effects
• Protection against STIs (especially condoms)
• Immediately reversible
• Available OTC
• Suitable for those with contraindications to hormonal methods

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Q7. Primary Health Care - Definition & Principles (1+4 = 5 Marks)

Definition of Primary Health Care

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Principles of Primary Health Care (8 elements + guiding principles)

1. Equitable distribution - PHC should be available equally to all, especially underserved populations.
2. Community participation - Individuals and communities must participate in planning, organizing, and delivering health care.
3. Intersectoral coordination - Health depends on agriculture, education, water supply, housing; all sectors must collaborate.
4. Appropriate technology - Use of methods, procedures, and technology that are scientifically valid, adaptable to local needs, and cost-effective.
5. Multisectoral approach - Health cannot be achieved by the health sector alone.

1. Education about prevailing health problems and methods of preventing/controlling them
2. Promotion of food supply and proper nutrition
3. Adequate supply of safe water and basic sanitation
4. Maternal and child health care, including family planning
5. Immunization against major infectious diseases
6. Prevention and control of locally endemic diseases
7. Appropriate treatment of common diseases and injuries
8. Provision of essential drugs

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Q8. Objective, Goal, and Planning Cycle (1+4 = 5 Marks)

Goal

Objective

• Specific - clearly defined
• Measurable - quantifiable
• Achievable - realistic
• Relevant - related to the goal
• Time-bound - with a specific deadline

• Outcome objectives (health status goals - e.g., reduce MMR)
• Process objectives (activities - e.g., conduct 4 ANC visits for 90% of pregnant women)

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Steps in Planning Cycle

1. Situation analysis / Problem identification:
   • Collection of data on health status, resources, needs
   • Identification of health problems using epidemiological data
2. Priority setting:
   • Prioritize problems based on magnitude, severity, community concern, feasibility of solution
   • Tools: Hanlon's method, PEARL criteria
3. Formulation of objectives:
   • Set SMART objectives based on priorities
4. Designing interventions / Planning:
   • Identify strategies, activities, methods
   • Decide on resources: manpower, money, material, time
5. Implementation:
   • Execute the plan
   • Operational activities set in motion
6. Monitoring:
   • Ongoing assessment during implementation
   • Check whether activities are being done as planned
7. Evaluation:
   • Assess whether objectives have been achieved
   • Assess efficiency, effectiveness, adequacy, impact
8. Feedback / Replanning:
   • Use evaluation results to modify and improve next cycle
   • The cycle restarts based on revised situation analysis

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SECTION B - SHORT ANSWERS

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Q9. Triage in Disaster Management (3 Marks)

• Maximize number of lives saved with limited resources
• Efficient use of personnel and equipment
• Facilitate transport of critical patients first

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Q10. Functions of UNICEF (3 Marks)

1. Child health - immunization, oral rehydration therapy (ORT), ARI management, polio eradication.
2. Nutrition - promoting breastfeeding, supplementary nutrition programmes, micronutrient supplementation (Vitamin A, iron-folate, iodization of salt).
3. Water and sanitation - safe water supply and sanitation for children.
4. Education - especially primary education for girls.
5. Child protection - protecting children from violence, exploitation, trafficking, child labour.
6. Emergency response - humanitarian assistance during disasters, conflicts, and epidemics.
7. Advocacy - for children's rights under the Convention on the Rights of the Child (CRC), 1989.
8. In India: UNICEF supports ICDS, immunization programmes, NHM, and school health initiatives.

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Q11. Health Hazards of Health Care Waste (3 Marks)

1. Infectious waste (used needles, bandages, dressings, pathological specimens):
   • Transmission of HIV, Hepatitis B, C
   • Needle-stick injuries to health care workers
   • Spread of nosocomial infections
2. Sharps waste (needles, syringes, scalpels, blades):
   • Injuries leading to blood-borne infections
   • Most dangerous category of HCW
3. Chemical waste (disinfectants, laboratory reagents, expired drugs):
   • Toxic, corrosive, flammable effects
   • Chemical burns, poisoning
4. Pharmaceutical waste (expired, unused drugs):
   • Antimicrobial resistance if improperly disposed
   • Soil and water contamination
5. Radioactive waste (radiotherapy materials):
   • Radiation exposure to workers and community
6. Pathological waste (human tissues, organs, body fluids):
   • Risk of infection; psychological impact

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Q12. Counterfeit Medicine + Ways to Identify Substandard Medical Products (1+2 = 3 Marks)

Counterfeit Medicine (Definition)

• No active ingredient
• Wrong active ingredient
• Correct active ingredient but in wrong quantity
• Impure or contaminated ingredients
• Correct ingredient with false packaging/labelling

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Ways to Identify Substandard/Counterfeit Medical Products

1. Physical inspection:
   • Check packaging for damage, discolouration, incorrect spelling, unusual smell/taste
   • Verify batch number, manufacturing date, expiry date, manufacturer's name and address
   • Hologram/security seals intact or not
2. Laboratory analysis (definitive method):
   • Quantitative analysis for active ingredient content
   • HPLC, mass spectrometry, thin-layer chromatography
   • Dissolution tests
3. Mini-lab testing (field tools):
   • Colour tests (e.g., dye tests for chloroquine)
   • Disintegration tests
   • Used in resource-limited settings
4. Track and trace systems:
   • Barcode/QR code verification
   • Electronic verification of product through supply chain
5. Reporting mechanisms:
   • WHO's Global Surveillance and Monitoring System (GSMS) for SSFFC medicines
   • India: Report to Central Drugs Standard Control Organisation (CDSCO)

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Q13. Prevention of Acute Respiratory Infections (ARI) (3 Marks)

1. Immunization:
   • Measles vaccine (measles predisposes to pneumonia)
   • DPT vaccine (pertussis)
   • Hib vaccine (Haemophilus influenzae type b - major cause of bacterial pneumonia)
   • PCV (Pneumococcal vaccine) - recommended, included in UIP
   • Influenza vaccine for high-risk groups
2. Nutritional interventions:
   • Promotion of exclusive breastfeeding for 6 months (provides passive immunity)
   • Vitamin A supplementation (reduces severity and mortality from ARI)
   • Correction of malnutrition (malnourished children more susceptible)
3. Environmental measures:
   • Reduce indoor air pollution (biomass fuel smoke)
   • Improved ventilation
   • Reduction of household overcrowding
4. Hygiene promotion:
   • Hand washing with soap and water
   • Respiratory hygiene/cough etiquette
   • Safe water and sanitation

• IMCI (Integrated Management of Childhood Illness) - ARI component
• Early recognition of pneumonia - Respiratory rate counting (tachypnoea), chest indrawing
• WHO ARI Control Programme - case management with cotrimoxazole/amoxicillin

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Q14. Prevention of Rheumatic Heart Disease (RHD) (3 Marks)

• Address poverty, overcrowding, malnutrition - the root causes
• Improve housing and living conditions

• Prompt diagnosis and treatment of Group A Streptococcal throat infection with:
  • Benzathine Penicillin G 1.2 million units IM single dose (drug of choice)
  • Alternatively: Oral Penicillin V for 10 days
  • In penicillin allergy: Erythromycin for 10 days
• Goal: Treat GAS pharyngitis before ARF can develop (within 9 days of onset)

• Penicillin prophylaxis (Benzathine Penicillin) after established ARF:
  • 1.2 million units IM every 3-4 weeks (3 weekly preferred in high-risk patients)
• Duration:
  • ARF without carditis: 5 years or until age 18 (whichever is longer)
  • ARF with carditis but no residual heart disease: 10 years or until age 25
  • ARF with carditis + residual RHD: Life-long
• WHO/NHM Register-based prophylaxis programme for ARF/RHD patients

• Surgical correction (valvotomy, valve replacement) for established RHD
• Dental/surgical prophylaxis to prevent infective endocarditis

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Q15. Strategy for Lymphatic Filariasis Elimination in India (3 Marks)

• Annual MDA with DEC (Diethylcarbamazine) + Albendazole (two-drug regimen) or
• Ivermectin + DEC + Albendazole (Triple Drug Therapy - IDA) - adopted for accelerated elimination
• Target: ≥65% therapeutic coverage of total population in endemic districts
• All eligible individuals (except pregnant women, children <2 years, seriously ill) take drugs once annually

• Home-based limb hygiene for lymphoedema (washing, exercise, elevation)
• Hydrocelectomy camps for hydrocele patients
• Preventing acute attacks (ADL episodes)

• To determine if transmission has been interrupted
• Surveys of school children (6-7 years) using immunochromatographic (ICT) test

• Anti-larval measures - oiling of breeding sites, chemical larvicides
• Anti-adult measures - insecticide spray, bed nets

• Monitoring microfilaraemia rates
• Tracking programme coverage and compliance

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Q16. Post-Operative Advice Given After Vasectomy (3 Marks)

1. Rest for 2-3 days - avoid heavy work or strenuous physical activity
2. Wear supportive underwear (scrotal support) for 2-3 days to reduce discomfort and swelling
3. Keep the wound dry and clean for 48 hours; avoid bath/swim
4. Apply ice pack to scrotum for first 4-6 hours to reduce swelling
5. Take analgesics (paracetamol) as prescribed for pain

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Q17. Complications of the Postpartum Period (3 Marks)

1. Postpartum Haemorrhage (PPH) - commonest cause of maternal death; primary PPH defined as blood loss >500 mL within 24 hours. Causes: Uterine atony (commonest - 4T: Tone, Trauma, Tissue, Thrombin), retained placenta, lacerations.
2. Retained placenta / Placental fragments
3. Puerperal shock (from haemorrhage or infection)

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Q18. Basic Resources for Providing Health Care (3 Marks)

• Physicians, nurses, paramedics, community health workers (ASHAs, ANMs, AWWs), pharmacists, lab technicians
• Most important resource; quality and distribution are key challenges in India
• Doctor-population ratio, nurse-population ratio are monitored

• Public financing: government health budget (Central and State)
• Private financing, health insurance (Ayushman Bharat PM-JAY)
• India's public expenditure on health ~2.1% of GDP (target: 2.5% by 2025 under NHP 2017)
• Community financing, user charges

• Health facilities: hospitals, CHCs, PHCs, sub-centres, urban health centres
• Equipment, diagnostics, drugs, vaccines, supplies
• Ambulances, cold chain equipment

• Administrative structure and governance
• Health information systems (HMIS, MCTS, ANMOL)
• Planning, supervision, monitoring, and evaluation mechanisms
• Policy and regulatory frameworks

• Appropriate and affordable technologies suited to local needs
• Telemedicine, e-health, mHealth (National Digital Health Mission)

• Epidemiological data, vital statistics, research evidence
• Needed for evidence-based decision making

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COMMUNITY MEDICINE - PAPER I: 10-MARK ANSWERS (Blue-highlighted Questions)

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Q1. Levels of Prevention & Modes of Intervention with Examples (10 Marks)

Levels of Prevention

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• Example: Many adult diseases (obesity, hypertension) have origins in childhood when lifestyles form. Primordial prevention discourages children from adopting harmful lifestyles (smoking, unhealthy eating, sedentary habits).
• Main intervention: Individual and mass education
• Target: Total population

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• Intervenes in the pre-pathogenesis phase
• Goal: Reduce incidence of disease
• Two approaches:
  • Health promotion (non-specific): Nutrition, exercise, good housing
  • Specific protection: Immunization, chemoprophylaxis, use of specific nutrients, occupational safety

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• Intervenes in the pathogenesis phase (early disease stage)
• Goal: Reduce prevalence of disease by shortening its duration
• Methods: Early diagnosis and prompt treatment (e.g., screening programmes)

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• Intervenes in the late stage of disease
• Two components:
  • Disability limitation: Preventing complications of established disease
  • Rehabilitation: Restoring function and quality of life (physical, psychological, social, vocational rehabilitation)

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Summary Table (K Park)

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Modes of Intervention

1. Health education
2. Environmental modifications (safe water, sanitation, housing)
3. Nutritional interventions (food distribution, fortification, child feeding programmes)
4. Lifestyle and behavioural changes

• Immunization
• Chemoprophylaxis (INH for TB contacts)
• Protection against occupational hazards (PPE)
• Protection from accidents
• Specific nutrients (Vit A, iodine)
• Avoidance of allergens and carcinogens

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Q2. Classify Epidemiological Study Designs + Steps of RCT with Example, Advantages & Disadvantages, Blinding (10 Marks)

Classification of Epidemiological Study Designs

EPIDEMIOLOGICAL STUDIES
├── OBSERVATIONAL
│   ├── Descriptive
│   │   ├── Case reports/Case series
│   │   ├── Cross-sectional (prevalence) studies
│   │   └── Ecological (correlational) studies
│   └── Analytical
│       ├── Case-control studies (retrospective)
│       └── Cohort studies (prospective/retrospective)
└── EXPERIMENTAL (Interventional)
    ├── Randomized Controlled Trials (RCT)
    ├── Field trials
    ├── Community trials
    └── Natural experiments

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Steps of a Randomized Controlled Trial (RCT)

• Clearly state the objective (e.g., "Does new typhoid vaccine reduce incidence by 50% over 2 years?")
• State null and alternative hypotheses

• Inclusion criteria: adults 15-45 years, no prior typhoid vaccination, residing in endemic area
• Exclusion criteria: immunocompromised, pregnant women

• Institutional Ethics Committee / ICMR guidelines
• Informed written consent from all participants

• Based on expected effect size, alpha (type I error = 0.05), beta (type II error = 0.20), power = 80%

• Randomly allocate participants to Study group (receives vaccine) and Control group (receives placebo)
• Types: Simple, systematic, stratified, cluster randomization
• Ensures comparability of groups at baseline
• Eliminates selection bias and confounding

• Single blind: Subject does not know which group they are in
• Double blind (preferred): Neither subject nor investigator knows (reduces observer and subject bias)
• Triple blind: Subject, investigator, AND data analyst are blinded
• Achieved using identical-appearing placebo

• Study group receives the new vaccine
• Control group receives identical placebo
• Ensure no cross-over; record compliance

• Equal follow-up of both groups over defined period (2 years)
• Monitor for outcome (typhoid incidence), adverse events, compliance

• Count number of typhoid cases in each group
• Use identical diagnostic criteria in both groups

• Calculate Relative Risk (RR), Vaccine Efficacy (VE)
• VE = (1 - RR) × 100
• Intention-to-treat analysis (all randomized participants analyzed in their original group)

• Follow CONSORT (Consolidated Standards of Reporting Trials) guidelines

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Advantages of RCT

1. Gold standard for establishing causality
2. Randomization eliminates confounding variables
3. Blinding eliminates bias
4. Direct calculation of incidence, relative risk, vaccine efficacy
5. Strongest evidence for treatment/prevention efficacy

Disadvantages of RCT

1. Expensive - high cost of conducting and monitoring
2. Time-consuming - especially for chronic disease trials
3. Ethical issues - withholding treatment from control group
4. Hawthorne effect - participants change behaviour when observed
5. Attrition bias - drop-outs may differ systematically
6. External validity - may not be generalizable to real-world populations
7. Not feasible for rare outcomes or long latency diseases
8. Cannot study harmful exposures

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Q14. Case-Control Study: Steps, Measures of Risk, Advantages & Disadvantages (10 Marks)

Definition

• Direction: Backward (from effect to cause)
• Also called: Retrospective study

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Steps of a Case-Control Study

• Define what constitutes a "case" using strict diagnostic criteria
• Sources: hospital records, disease registry, death certificates, community surveys
• Incident cases preferred over prevalent cases (avoid survival bias)

• Must come from same source population as cases (comparable)
• Should be free of the disease under study
• Sources: hospital controls, community controls, neighbourhood controls, friends/relatives
• Matching: Individual matching or group matching for age, sex, socioeconomic status

• Collect information on past exposure to suspected risk factor
• Methods: Interviews, questionnaires, medical records, biological specimens
• Collected by blinded interviewers to avoid interviewer bias

• Calculate Odds Ratio (OR) as measure of association

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Measure of Risk: Odds Ratio (OR)

• OR = 1: No association
• OR > 1: Positive association (risk factor)
• OR < 1: Protective association

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Advantages of Case-Control Study

1. Suitable for rare diseases (e.g., rare cancers)
2. Relatively quick and inexpensive (no long follow-up needed)
3. Retrospective - outcome has already occurred
4. Can study multiple exposures for one disease simultaneously
5. No risk to participants (observational only)
6. Useful for hypothesis generation and testing

Disadvantages

1. Recall bias - cases remember past exposure differently than controls
2. Selection bias - difficulty selecting appropriate controls
3. Cannot calculate incidence rates or attributable risk directly
4. Only one outcome studied at a time
5. Cannot establish causal relationship definitively
6. Susceptible to confounding
7. Not suitable for rare exposures

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Q15. Occupational Diseases: Classification, Prevention, Medical Measures, Legislation (ESI + Factories Act) (10 Marks)

Classification of Occupational Diseases

1. Heat-related: Heat stroke, heat exhaustion (miners, boiler workers)
2. Cold-related: Frostbite, hypothermia
3. Noise-induced hearing loss (NIHL) - most common occupational disease
4. Vibration diseases: Raynaud's phenomenon (white finger)
5. Radiation diseases: Radiation dermatitis, bone marrow suppression
6. Compressed air diseases: Caisson disease (decompression sickness), barotrauma

1. Pneumoconioses (dust diseases of lungs):
   • Silicosis (free silica - miners, stone crushers)
   • Asbestosis (asbestos - ship building)
   • Byssinosis (cotton dust - textile workers)
   • Coal workers' pneumoconiosis (CWP)
   • Bagassosis (sugarcane bagasse)
   • Farmer's lung (mouldy hay)
2. Metal poisoning: Lead, mercury, cadmium, arsenic
3. Solvent toxicity: Benzene (aplastic anaemia), carbon tetrachloride
4. Occupational cancers: mesothelioma (asbestos), bladder cancer (naphthylamine)
5. Occupational asthma: TDI (toluene di-isocyanate)

• Anthrax (animal handlers, wool sorters)
• Brucellosis (veterinarians, farmers)
• Leptospirosis (sewer workers, rice field workers)

• Occupational stress, burnout, work-related musculoskeletal disorders

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Prevention Measures

1. Pre-placement examination: Identify persons unsuitable for specific occupational exposures
2. Substitution: Replace toxic chemical with less toxic one
3. Enclosure: Enclose hazardous operations (dust-tight)
4. Exhaust ventilation: Remove contaminants at source
5. Wet methods: Use wet drilling to reduce dust
6. Personal Protective Equipment (PPE): Masks, gloves, goggles, helmets, ear muffs
7. Rotation of workers: Limit time of exposure
8. Health education: Train workers about hazards and precautions
9. Biological monitoring: Blood/urine lead levels

1. Periodic medical examinations for early detection
2. Lung function tests (spirometry) for pneumoconioses
3. Audiometry for NIHL
4. Biological monitoring (blood lead, urinary mercury)
5. Chest X-ray surveillance for dust diseases

• Treatment of established disease
• Rehabilitation and redeployment

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Medical Measures

1. Pre-employment examination: Baseline health status; identify contraindications
2. Periodic health examination: Detect early signs of occupational disease
3. Treatment: Prompt treatment of occupational diseases
4. Rehabilitation: Occupational therapy, redeployment

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Legislation

• Applies to non-seasonal factories with ≥10 workers using power (or ≥20 without power)
• Extended to shops, hotels, cinemas, etc. with ≥20 workers
• Provides social security benefits:
  1. Sickness benefit (70% of wages for 91 days)
  2. Maternity benefit (100% wages for 26 weeks)
  3. Disablement benefit (temporary/permanent)
  4. Dependant's benefit (death of insured person)
  5. Medical benefit (full medical care for insured and family)
  6. Funeral expenses
• Funded by: Employer (3.25% of wages) + Employee (0.75% of wages) + Government

• Applies to factories with ≥10 workers (with power) or ≥20 (without power)
• Chapter III (Health): Cleanliness, disposal of wastes, ventilation, temperature, dust & fumes control, artificial humidification, overcrowding, lighting, drinking water, latrines and urinals, spittoons
• Chapter IV (Safety): Fencing, machinery safety, fire exits, pressure vessels
• Chapter V (Welfare): Washing facilities, sitting facilities, first aid, canteens, crèches, rest rooms
• Occupational Safety Health and Working Conditions Code 2020 replaced Factories Act in 2020 (latest)
• Specific schedules list notifiable occupational diseases (15 scheduled diseases)

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Q16. Cohort Study: Types, Steps, Measures of Risk, Advantages & Disadvantages + Cohort vs Case-Control (10 Marks)

Definition

• Direction: Forward (from cause to effect)
• Also called: Prospective study / Longitudinal study / Incidence study / Follow-up study

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Types of Cohort Study

1. Prospective cohort study (concurrent): Cohort identified in present and followed into the future. Exposure assessed at start. Most reliable but time-consuming.
2. Retrospective cohort study (historical): Both exposure and outcome have already occurred. Uses past records. Quicker but dependent on record quality.
3. Ambidirectional cohort: Part prospective + part retrospective.
4. Open cohort (Dynamic cohort): New members can join during study period.

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Steps of Cohort Study

1. Select study population: Define cohort based on exposure (e.g., smokers and non-smokers)
2. Assess exposure status: Classify all subjects as exposed or unexposed at baseline
3. Follow-up: Observe both groups over time (years) for development of outcome
4. Measure outcome: Record disease incidence in both groups
5. Analysis: Calculate incidence rates and measures of association

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Measures of Risk in Cohort Study

1. Incidence rate in exposed = a/(a+b)
2. Incidence rate in unexposed = c/(c+d)
3. Relative Risk (RR) = [a/(a+b)] / [c/(c+d)]
   • RR = 1: No association
   • RR > 1: Increased risk (risk factor)
   • RR < 1: Protective
4. Attributable Risk (AR) / Risk Difference = Incidence in exposed - Incidence in unexposed
   • Indicates excess risk due to exposure
5. Attributable Risk Percent (AR%) = (RR-1)/RR × 100
   • Proportion of disease in exposed attributable to the exposure
6. Population Attributable Risk (PAR) = Overall incidence - Incidence in unexposed
   • Amount of disease in the entire population attributable to the exposure

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Advantages of Cohort Study

1. Best design for establishing temporal relationship (cause precedes effect)
2. Direct calculation of incidence rates and relative risk
3. Can study multiple outcomes from one exposure
4. Recall bias is minimal (exposure assessed before disease develops)
5. Allows study of natural history of disease
6. Exposure measured prospectively and accurately

Disadvantages

1. Expensive and time-consuming (years of follow-up)
2. Not suitable for rare diseases (need very large sample)
3. Attrition/loss to follow-up can bias results
4. Changing exposure status over time complicates analysis
5. Risk of secular changes affecting outcome independently

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Cohort vs Case-Control Study

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Q26. Investigation of an Epidemic: Steps with Example (10 Marks)

Definition

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Objectives of Epidemic Investigation

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Steps of Epidemic Investigation

• Confirm the diagnosis clinically and laboratory from a sample of cases
• Rule out spurious reports/misdiagnosis
• Epidemiological investigation should not wait for lab results
• Example: In a diarrhoea outbreak, confirm Cholera by stool culture

• Compare observed disease frequency with expected frequency (from same period in previous years)
• Epidemic threshold: >2 standard errors above endemic level
• Example: Current cholera cases exceed the expected number based on last 5 years

• Establish a working case definition (clinical/laboratory criteria)
• Classify as: Confirmed case, Probable case, Suspected case
• Example: Confirmed cholera = rice-watery diarrhoea + Vibrio cholerae isolated in stool

• Enumerate all cases by Time, Place, Person
• Construct: a) Epidemic curve (time), b) Spot map (place), c) Person characteristics (age, sex, occupation, attack rates)

• Time: Epidemic curve (histogram) - determines type of epidemic (point source vs propagated)
• Place: Spot map - identifies geographical clusters
• Person: Attack rates by age, sex, occupation, food consumed

• Based on time-place-person analysis and Agent-Host-Environment model:
  • Possible source of infection
  • Causative agent
  • Mode(s) of spread
  • Environmental factors that enabled it
• Example: Cholera outbreak may be due to contaminated water from a broken pipeline

• Compare attack rates in exposed vs unexposed groups
• Use case-control or cohort approach within the outbreak
• Statistical testing (Chi-square, odds ratio, relative risk)
• Example: Attack rate in those who drank municipal water = 60%; in those who drank bottled water = 5% → RR = 12

• Sanitary status of eating establishments, water/milk supply
• Breakdown in water supply; atmospheric changes; population movement
• Example: Inspect the water treatment plant - found chlorinator out of service

• Medical examination, screening tests, stool/blood cultures
• Serological studies to find inapparent cases
• Assess immunity status of population

• Complete and convincing report including:
  • Background (geography, demographics, health services)
  • Description (cases, attack rates, distribution)
  • Analysis (hypothesis testing, results)
  • Conclusions (cause, source, mode of transmission)
  • Recommendations (immediate control + future prevention)

• Treat cases; isolate if necessary
• Disinfect water supply; chlorinate
• Trace contacts
• Immunization of susceptibles if vaccine available
• Health education

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Q39. Natural History of Disease + Schematic Diagram (10 Marks)

Natural History of Disease

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Stages of Natural History

• The disease process has not yet begun in the host
• Exists in the environment - interaction between agent, host, and environment
• The ecological triad (host, agent, environment) is the basis
• Conditions for disease are being laid (e.g., exposure to carcinogens, infectious agent)
• Intervention: Primordial prevention, primary prevention

• Disease process has begun but there are no clinical signs or symptoms
• Tissue and physiological changes are occurring
• Only detectable by laboratory tests or screening
• Corresponds to incubation period in infections, latent period in chronic diseases
• Intervention: Secondary prevention (early diagnosis via screening)

• Signs and symptoms become apparent
• Disease progresses to:
  • Full clinical disease
  • Complications
  • Defect/disability
  • Chronicity
  • Death
  • Recovery

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Schematic Diagram

PRE-PATHOGENESIS          |         PATHOGENESIS PHASE
PHASE                     |
                          |
Stimulus → Host-Agent     | Entry of   → Early          → Clinical
(risk factors  interaction  agent into   pathogenesis      disease
in environment) builds      host        (subclinical)      ↓
                          |                              Recovery /
                          |                              Disability /
                          |                              Death
↑                         |    ↑                 ↑
Primordial &              |  Secondary      Tertiary
Primary prevention        | prevention    prevention
                          |
         ← Point of application of prevention →

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Key Concepts Related to Natural History

• Clinical cases (visible tip) represent only a small proportion of total disease burden
• Subclinical / inapparent infections (below waterline) are far more numerous
• Example: Polio - for every paralytic case there are many inapparent infections
• Implies: True disease burden is underestimated by clinical records alone

• Ranges from subclinical → mild → moderate → severe → death
• Determines: secondary attack rates, epidemic behaviour, immunity in community

• Time from entry of agent to first clinical symptom
• Used for: quarantine periods, source tracing, epidemic curve analysis

• Protection of susceptible population when sufficient proportion is immune
• Disrupts transmission chains

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Q41. Health and Disease: Social Factors, Cultural Factors, Culture Contact (10 Marks)

Concept of Health and Disease

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Social Factors in Health and Disease

• Poverty is the single most important social determinant of health
• Associated with malnutrition, poor housing, lack of clean water, poor sanitation, inability to access health care
• Affects disease pattern: TB, cholera, malaria, nutritional deficiencies predominantly affect the poor
• "Poverty is the greatest pollutant" - Indira Gandhi

• Education - especially female literacy - is a powerful determinant of child and maternal health
• Educated mothers make better use of health services, better nutrition, better hygiene
• Higher literacy → lower IMR, MMR, TFR

• Occupational hazards: pneumoconioses, lead poisoning, occupational accidents
• Unemployment → stress, depression, alcohol abuse
• Socioeconomic gradient in disease burden

• Higher social class → better health outcomes
• Lower classes bear disproportionate disease burden (inverse care law)

• Family structure (joint vs nuclear) influences disease patterns
• Joint families: social support but also cross-infection, stress
• Single-parent families: poverty and mental health risk

• Urban slums: overcrowding, poor sanitation → infectious disease
• Urban lifestyle: stress, sedentary life → CHD, diabetes, cancer

• Health policies, social security, insurance, healthcare accessibility

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Cultural Factors in Health and Disease

• Vegetarianism (iron deficiency) vs non-vegetarianism
• Food taboos during pregnancy (avoid certain nutritious foods → malnutrition)
• Customs of feeding children watery gruel instead of solid foods → malnutrition

• Open defecation, non-use of toilets → faeco-oral disease spread
• Reluctance to use condoms (cultural/religious) → STI/HIV spread

• Hindu belief: cow is sacred → may resist campaigns against stray cattle (brucellosis, bovine TB)
• Muslim dietary laws: prohibition of pork → protection from cysticercosis, trichinosis
• Refusal of blood transfusion (Jehovah's Witnesses) → avoidable deaths

• Use of faith healers and traditional medicine may delay biomedical care
• Harmful traditional practices (e.g., applying cow dung to umbilical stump → tetanus neonatorum)

• Women may be last to receive food (nutritional deficiency)
• Lack of female autonomy in health decision-making → delayed ANC, low institutional delivery

• Child marriage → early pregnancy and its complications
• Consanguineous marriage → genetic disorders

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Culture Contact and Health

• Adoption of host culture's habits
• Beneficial: adoption of hand washing, condom use, health services
• Harmful: adoption of fast food culture, alcohol, tobacco → rising NCD burden in developing countries

• Rapid urbanization → sedentary lifestyle, high-fat diet → CHD, diabetes, obesity epidemic

• Migration and culture change → mental health problems (stress, alienation, identity crisis)

• Rapid international travel → spread of infectious diseases across cultures

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Q46. Air Pollution: Monitoring, Pollutants, Indicators, Index, Effects, Prevention & Control (10 Marks)

Definition

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Major Air Pollutants

1. Sulphur dioxide (SO₂) - from coal burning, industries; causes acid rain, respiratory disease
2. Nitrogen oxides (NOₓ) - vehicle exhaust; photochemical smog
3. Carbon monoxide (CO) - incomplete combustion; carboxyhaemoglobin formation; most dangerous
4. Ozone (O₃) - secondary pollutant from NOₓ + hydrocarbons + sunlight; photochemical smog
5. Hydrocarbons - vehicle exhaust, oil refineries; some carcinogenic
6. Carbon dioxide (CO₂) - greenhouse gas; global warming

• SPM (Suspended Particulate Matter): Total suspended particles; cause respiratory disease
• PM10: Particles <10 μm; enter airways
• PM2.5: Most dangerous; penetrate alveoli; cause CHD, cancer
• Dust, smoke, soot, pollen

• Biomass fuel smoke (woodsmoke, cow dung cake) - major cause of ARI in women and children in India
• Tobacco smoke
• Radon gas (lung cancer)

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Indicators/Index of Air Pollution

• Comprehensive indicator combining 8 pollutants: PM10, PM2.5, NO₂, SO₂, CO, O₃, NH₃, Pb
• AQI categories:
  • 0-50: Good
  • 51-100: Satisfactory
  • 101-200: Moderate
  • 201-300: Poor
  • 301-400: Very Poor
  • 401-500: Severe/Hazardous

• Coefficient of Haze (COH): measures smoke particles
• Soiling index: degree of blackening of filter paper
• Dust fall rate

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Monitoring of Air Pollution in India

• National Air Quality Monitoring Programme (NAQMP): Sponsored by Central Pollution Control Board (CPCB) since 1990
• Covers 10 major cities: Delhi, Mumbai, Kolkata, Chennai, Ahmedabad, Hyderabad, Jaipur, Kanpur, Kochi, Nagpur
• Parameters measured: SO₂, NO₂, PM10, PM2.5
• National Ambient Air Quality Standards (NAAQS): Set by CPCB; revised in 2009

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Health Effects of Air Pollution

1. Irritation of eyes, nose, throat
2. Aggravation of asthma, COPD, bronchitis
3. Acute respiratory infections (especially in children)
4. CO poisoning: headache, dizziness, death

1. Chronic bronchitis, emphysema, COPD
2. Lung cancer (PM2.5, polycyclic aromatic hydrocarbons)
3. Cardiovascular disease (PM2.5 - systemic inflammation, atherosclerosis)
4. Adverse pregnancy outcomes: low birth weight, preterm birth
5. Effects on CNS (lead, CO)

• London smog (1952): 4000 deaths due to SO₂ + fog + particles
• Bhopal disaster (1984): Methyl isocyanate (MIC) leak - worst industrial disaster

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Prevention and Control of Air Pollution

1. Fuel substitution: Clean energy (solar, wind, CNG, LPG) instead of coal/biomass
2. Industrial control: Tall chimneys, cyclone collectors, electrostatic precipitators, scrubbers
3. Vehicle emission standards: BS-VI (Bharat Stage 6) emission norms; catalytic converters
4. Banning crop burning (major source of PM in north India)
5. Use of clean cookstoves; Pradhan Mantri Ujjwala Yojana (LPG for rural women)

• Tall chimneys to disperse pollutants at height
• Urban planning: industrial zones away from residential areas

• Green belts around industries
• Buffer zones

• Air Prevention and Control of Pollution Act, 1981 (India)
• Environment Protection Act, 1986
• National Clean Air Programme (NCAP): Reduce PM10/PM2.5 by 40% by 2026

• Montreal Protocol (ozone-depleting substances)
• Kyoto Protocol, Paris Agreement (greenhouse gases/climate change)

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Q53. ANC Case (2nd Trimester) with Inadequate Weight Gain + Low Calorie Intake (10 Marks)

a) Daily Calorie + Protein Requirements Recommended in Pregnancy

• 1st trimester: 1-2 kg total
• 2nd trimester: ~5-6 kg
• 3rd trimester: ~5-6 kg
• Total: 10-12 kg (for normal BMI woman)

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b) Extra Nutrients Required in Pregnancy + Daily Requirements

• IFA (Iron-Folic Acid) tablets: 60 mg elemental iron + 500 μg folic acid daily from 14 weeks for 180 days
• Calcium supplementation: 1g/day from 2nd trimester
• Vitamin D supplementation (as per state protocols)

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c) Diet Plan (Calorie + Protein) as per RDA for a 2nd Trimester Pregnant Woman

1. Eat small frequent meals (5-6 times/day) to avoid nausea and optimize absorption
2. Include iron-rich foods (green leafy vegetables, jaggery, meat, lentils) with Vitamin C source to enhance absorption
3. Calcium-rich foods: milk, curd, paneer, ragi, sesame
4. Avoid tea/coffee immediately after meals (inhibits iron absorption)
5. Include folate-rich foods: green leafy vegetables, legumes
6. If vegetarian: ensure adequate B12 via dairy products, fortified foods
7. Safe weight gain goal in 2nd trimester: 0.35-0.4 kg/week
8. Continue IFA and calcium supplements daily

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Q60. Cold Chain Equipment, System + Open Vial Policy (10 Marks)

Cold Chain

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Cold Chain Equipment (Level-wise)

• Standard cold chain equipment at PHC/district level
• Lining of ice containers around the chamber
• Can maintain cold temperature for 12-18 hours after power failure

• Temperature: -15°C to -25°C
• For storing OPV and ice packs

• Insulated box with 4 conditioned ice packs
• Used at session sites
• Can maintain +2 to +8°C for 48 hours

• For transport; capacity 20-30 litres
• Short-term storage

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Cold Chain System (Reverse Cold Chain)

• A heat-sensitive label on each vial
• Changes colour when exposed to excessive heat
• Inner square darker than outer circle → discard

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Open Vial Policy (OVP)

• OPV, DPT, DT, TT, Hepatitis B, BCG - can be reused in subsequent sessions if:
  1. Vaccine has not expired
  2. VVM has not reached discard point
  3. Vial has been stored at +2°C to +8°C
  4. Aseptic technique has been followed (no contamination)
  5. Within 4 weeks for BCG; 28 days for others

• A regular drill/practice of the entire cold chain system
• Identifies gaps and ensures functionality before major immunization campaigns

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Q61. Food Fortification, Adulteration with Examples, Definition, PFA Act (10 Marks)

Food Fortification

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Food Adulteration

1. Any substance is added which is injurious to health
2. Any inferior/cheap substance is substituted for it
3. Any valuable constituent has been wholly or partly removed
4. It has been prepared under insanitary conditions
5. It consists wholly or partly of diseased, putrid, or decomposed substance
6. It has been coloured/flavoured to disguise its inferior quality
7. It contains any prohibited preservative or excess permitted preservative

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Prevention of Food Adulteration (PFA) Act, 1954

• Full name: Prevention of Food Adulteration Act, 1954
• Replaced by: Food Safety and Standards Act (FSSA), 2006 → implemented through FSSAI (Food Safety and Standards Authority of India)

1. Defined adulteration and misbranding of food
2. Created Central Committee for Food Standards
3. Appointed Food Inspectors at district level to collect samples
4. Procedure: Inspector collects sample → divided into 3 parts (one to manufacturer/seller, one to lab, one for court) → sent to Public Analyst
5. Prescribed penalties:
   • Simple adulteration: Fine + imprisonment
   • Adulteration injurious to health: Imprisonment up to 6 years + fine
   • Death due to adulteration: Imprisonment up to life

• Single regulatory body replacing multiple laws
• Risk-based approach
• Standards for food safety, hygiene, labelling
• Licensing of food businesses
• Food testing laboratories accredited

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Q70. Accidents in Industry + Pre-Placement Examination (10 Marks)

Industrial Accidents

1. Fractures, dislocations
2. Lacerations, contusions, abrasions
3. Burns (thermal, chemical)
4. Eye injuries
5. Amputations
6. Fatal injuries

1. Unsafe acts (~85% of accidents): Operating without authority, using defective equipment, removing safety devices, improper use of tools
2. Unsafe conditions (~15%): Defective equipment, inadequate machine guards, poor lighting, slippery floors

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Causes of Industrial Accidents

• Fatigue and monotony (accident peak on Monday and Friday)
• Inexperience and lack of training
• Personal characteristics: age (young workers), alcohol/drug use
• Psychological factors: stress, inattention, taking risks
• Medical conditions: epilepsy, colour blindness

• Poor housekeeping; cluttered workplaces
• Inadequate lighting, noise, heat → distraction
• Defective machinery; no guards
• Chemical hazards

• Inadequate supervision
• Poor safety training
• Long working hours; night shifts
• No safety culture

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Measurement of Accidents

1. Frequency Rate = (Number of disabling injuries × 10⁶) / Man-hours worked
2. Severity Rate = (Days lost × 10⁶) / Man-hours worked
3. Incidence Rate = (Number of injuries / Number of workers) × 1000

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Prevention of Industrial Accidents

1. Engineering: Machine guarding, ergonomic design, safety devices
2. Education: Safety training, health education, induction programmes
3. Enforcement: Factories Act provisions, safety regulations, inspections

• Pre-placement examination
• Periodic medical surveillance
• PPE provision
• Safety committees
• Accident investigation and reporting
• Shift rotation, adequate rest periods

---

Pre-Placement Examination

1. Assess health status of the prospective employee
2. Identify persons unsuitable for certain jobs (e.g., epileptic for heights, colour-blind for electrical work)
3. Establish a baseline health record for future comparison
4. Place the right person in the right job
5. Identify pre-existing conditions to prevent aggravation by occupational exposure
6. Medico-legal protection of employer

1. History: Occupational history, past illnesses, family history, substance use
2. Clinical examination: Full systemic examination including neurological, musculoskeletal, cardiovascular, respiratory assessment
3. Vision testing: Visual acuity, colour vision (for colour-sensitive jobs)
4. Audiometry: Baseline hearing assessment (for noisy industries)
5. Lung function tests (PFTs/Spirometry): Baseline for dusty trades
6. Chest X-ray: Baseline for workers exposed to dust/silica
7. Blood tests: CBC, blood sugar, liver function (for chemical exposures)
8. Urine examination
9. ECG (for jobs involving physical strain or stress)

• Miners: Chest X-ray (silicosis baseline)
• Painters/battery workers: Blood lead level
• Chemical workers: Liver function tests
• Food handlers: Stool culture (to rule out typhoid/enteric carrier state), skin condition

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Q73. Community Nutrition Programmes in India (10 Marks)

Community Nutrition Programmes in India

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• Launched: 1975 (World's largest child development programme)
• Target: Children 0-6 years, pregnant women, lactating mothers, adolescent girls
• Services (package of 6): Supplementary nutrition, immunization, health check-up, referral services, nutrition & health education, pre-school non-formal education
• Delivery: Through Anganwadi Centres (AWCs) by Anganwadi Workers (AWW)
• Supplementary nutrition: 300 kcal + 8-10g protein for children; 500 kcal + 17g protein for pregnant/lactating women; 600 kcal + 18-20g protein for severely malnourished children

• Launched: 1995 (National Programme of Nutritional Support to Primary Education)
• Renamed PM POSHAN in 2021
• Target: Children in Classes 1-8 in government and government-aided schools
• Provides: Cooked hot meal with minimum 450 kcal + 12g protein (primary), 700 kcal + 20g protein (upper primary)
• Benefits: Improves enrollment, attendance, retention, reduces classroom hunger

• Prophylactic IFA supplementation to vulnerable groups
• Pregnant women: 1 IFA tablet (100mg iron + 500μg folic acid) daily for 180 days
• Children 6-60 months: IFA syrup (20mg elemental iron) weekly
• Adolescent girls (WIFS): Weekly IFA supplementation (weekly iron and folic acid supplementation)

• Universal iodization of salt (15-30 ppm at production, 15 ppm at consumer level)
• Monitoring urinary iodine excretion and goiter surveys
• Lab testing of salt iodine content

• Children 9 months to 5 years receive Vitamin A every 6 months
• 1st dose (9 months): 1,00,000 IU
• Subsequent doses (18 months-5 years): 2,00,000 IU every 6 months
• Prevents night blindness, xerophthalmia, reduces child mortality by 25%

• Kishori Shakti Yojana (KSY) merged into SABLA (Rajiv Gandhi Scheme for Empowerment of Adolescent Girls)
• Now: POSHAN Abhiyan / Mission POSHAN 2.0 (2018)
• Target: Adolescent girls 11-18 years (focus on out-of-school girls)

• Maternity Benefit Programme
• Cash transfer of Rs. 5000 to pregnant women for first living child
• Encourages early registration of pregnancy, ANC, breastfeeding

• Convergent approach to reduce stunting, underweight, anaemia, and low birth weight
• Targets by 2022: Reduce stunting by 2%/year, underweight by 2%/year, anaemia by 3%/year, LBW by 2%/year
• Uses technology (ICDS-CAS app), community mobilization (Poshan Maah - September)

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Q97. Food Poisoning + Investigation of Food Poisoning (10 Marks)

Food Poisoning

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Classification of Food Poisoning

• Chemical poisons: Lead, arsenic, mercury
• Mycotoxins: Aflatoxins (Aspergillus flavus in groundnuts/maize) → liver cancer
• Plant toxins: Mushroom poisoning (Amanita phalloides), lathyrism (Lathyrus sativus)
• Fish toxins: Ciguatera, puffer fish (tetrodotoxin), scombroid
• Argemone oil in mustard oil → epidemic dropsy

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Investigation of a Food Poisoning Outbreak

• Examine a sample of cases clinically
• Note: incubation period, predominant symptoms (vomiting vs diarrhoea), attack rate
• Collect stool/vomit/blood samples for bacteriological analysis

• Establish that disease frequency exceeds expected levels
• Determine if cases are linked by common food

• Define a case (e.g., "any person who ate at the function and developed vomiting/diarrhoea within 24 hours")
• List all cases with name, age, symptoms, onset time, foods consumed

• Plot cases by time of onset → determines single source (sharp peak) vs propagated source
• Calculate incubation period from median/mean onset time

• Map cases geographically → identifies common location (restaurant, function hall)

• Attack rates by food consumed (food-specific attack rates)
• Use a table to compare attack rates in those who ate and did not eat each food item

• Remnants of suspected food items
• Kitchen environment swabs
• Water supply samples
• Food handlers' stool and nasal swabs

• Culture of stool/vomit/food samples
• Identify causative organism (Salmonella, Staphylococcus, etc.)
• Food quality tests (bacteria count, toxin assay)

• Suspected food + probable cause + mode of contamination
• Calculate: Relative Risk or Odds Ratio for each food item

• Remove suspected food from circulation
• Treat cases (ORS, antibiotics if bacterial)
• Temporary closure of food premises
• Decontamination of kitchen
• Food handlers: treat carriers; medical check

• For future prevention: hygiene training, proper food storage (below 5°C or above 60°C), cooking temperatures, carrier detection

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Q107. Sewage, Sullage, Modern Sewage Treatment Plant (10 Marks)

Definitions

• Sewage = All waste water including toilet flush water (black water + grey water)
• Sullage = Only grey water (no faecal matter)

---

Composition of Sewage

• 99.9% water
• 0.1% solids (organic and inorganic matter)
• Contains: bacteria, viruses, helminth eggs, suspended solids, BOD (biological oxygen demand)

---

Methods of Sewage Disposal

---

Modern Sewage Treatment Plant

• Screening: Removes large solids (rags, wood, paper) through metal screens
• Grit chamber: Removes grit, sand, heavy particles by reducing flow velocity
• Purpose: Protect downstream equipment

• Sedimentation tanks / Primary settling tanks: Allow suspended solids to settle as primary sludge (50-60% SS removal, 30% BOD reduction)
• Skimming: Remove floating grease and oil from surface
• Produces: Clarified liquid + Primary sludge

• Removes dissolved and colloidal organic matter using biological oxidation
• Methods:
  • Trickling Filters (Percolating filters): Sewage trickled over stones/plastic media covered with biofilm; bacteria oxidize organic matter; effluent 80-90% purified
  • Activated Sludge Process: Sewage aerated in tanks with return sludge; highly efficient (90-95% BOD removal); aerobic organisms breakdown organic matter
  • Oxidation ponds / Stabilization ponds: Large shallow lagoons; algae produce O₂; bacteria decompose; sunlight kills pathogens; suitable for India

• Removes remaining nutrients (nitrogen, phosphorus), pathogens
• Methods: Filtration, chemical precipitation, chlorination, UV disinfection
• Produces high-quality effluent suitable for recycling/reuse

• Primary + secondary sludge → Sludge digestion tanks (anaerobic): Produces biogas (methane) as energy
• Digested sludge → Dried and used as manure/fertilizer
• Final disposal: Land application, composting, landfill

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Standards for Treated Sewage Discharge (India - CPCB)

• BOD ≤ 20 mg/L
• Suspended Solids ≤ 30 mg/L
• pH: 6.5-9.0

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Q120. Malnutrition: Preventive & Social Measures (10 Marks)

Malnutrition

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Causes of Malnutrition (Ecological Triad / UNICEF Model)

1. Inadequate dietary intake
2. Disease (infections increase needs, reduce intake, impair absorption)

1. Food insecurity (inadequate food access)
2. Inadequate care practices (infant and child feeding)
3. Poor health services and unhealthy environment

1. Poverty
2. Low education
3. Social inequality (gender discrimination)
4. Political and economic factors

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Preventive and Social Measures for Malnutrition

1. Promotion of breastfeeding:
   • Exclusive breastfeeding for 6 months (provides complete nutrition + immunity)
   • Continued breastfeeding with complementary feeding up to 2 years
   • Early initiation within 1 hour of birth (colostrum)
2. Complementary feeding (Weaning):
   • Start at 6 months with semi-solid home foods
   • Nutritionally adequate, safe, and age-appropriate
   • Frequency: 2-3 times/day at 6-8 months; 3-4 times at 9-23 months
3. Food diversification:
   • Use of multiple food groups (cereals + pulses = complete protein)
   • Use of vitamin/mineral-rich foods (green leafy vegetables, eggs, dairy)
4. Food Fortification:
   • Iodized salt, fortified oil (Vit A+D), double fortified salt, fortified flour
   • Reduces micronutrient deficiency without dietary change
5. Supplementary feeding programmes:
   • ICDS supplementary nutrition (Anganwadi)
   • Mid-day meal programme (school children)
   • TPDS (Targeted Public Distribution System) - subsidized food grains

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• Infections → malnutrition (vicious cycle)
• Immunization against measles, pertussis (prevent PEM trigger)
• ORS and Zinc for diarrhoea management (prevent nutrient loss)
• Deworming (Albendazole biannually for children 1-19 years under National Deworming Day)
• Safe water supply and sanitation → reduce diarrhoeal disease burden (WASH)

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1. Poverty alleviation:
   • MGNREGA (employment guarantee)
   • PDS (food security)
   • PM Kisan (farmer income support)
2. Empowerment of women:
   • Female education (most powerful determinant)
   • Delay marriage (PCMA - Prohibition of Child Marriage Act)
   • Birth spacing (family planning)
3. Food security:
   • National Food Security Act (NFSA) 2013: Right to food (5 kg grains/month at subsidized price to 75% rural + 50% urban population)
4. Health services:
   • Regular growth monitoring (weight-for-age charts at AWC/VHND)
   • Nutrition Rehabilitation Centres (NRCs) for SAM (Severe Acute Malnutrition)
   • CMAM (Community-based Management of Acute Malnutrition): RUTF (Ready-to-Use Therapeutic Food) for SAM at community level
5. National Programmes:
   • POSHAN Abhiyan (Mission POSHAN 2.0, 2018): Convergent mission; targets stunting, wasting, underweight, anaemia; Poshan Maah (September), Jan Andolan
   • ICDS
   • Anaemia Mukt Bharat
6. Nutrition education:
   • Counselling at AWC, VHND sessions
   • Behaviour Change Communication (BCC)
   • Use of growth chart to monitor child development

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• All 18 questions answered in detail - NTEP/TB, MCH indicators, Maternal Mortality, CHD, ICTC/PPTCT, Demographic Cycle, Contraception, PHC, Planning Cycle, Triage, UNICEF, Health Care Waste, Counterfeit Medicine, ARI/RHD prevention, Lymphatic Filariasis, Vasectomy advice, Postpartum complications, Basic Health Resources

• Q1: Levels of Prevention + Modes of Intervention
• Q2: Epidemiological Study Designs + RCT steps
• Q14: Case-Control Study
• Q16: Cohort Study + Cohort vs Case-Control
• Q26: Investigation of Epidemic
• Q39: Natural History of Disease
• Q41: Health & Disease - Social/Cultural factors
• Q46: Air Pollution
• Q53: ANC Nutrition/Diet in Pregnancy
• Q60: Cold Chain + Open Vial Policy
• Q61: Food Fortification + Adulteration + PFA Act
• Q70: Industrial Accidents + Pre-placement Exam
• Q73: Community Nutrition Programmes
• Q97: Food Poisoning + Investigation
• Q107: Sewage, Sullage, Sewage Treatment Plant
• Q120: Malnutrition - Preventive & Social Measures

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COMMUNITY MEDICINE - ALL ANSWERS (Q110–Q142)

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Q110. Demographic Cycle

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Q111. Essential Obstetric Care (EOC)

1. Administration of parenteral antibiotics
2. Administration of parenteral oxytocics (uterotonic drugs)
3. Administration of parenteral anticonvulsants (for eclampsia)
4. Manual removal of placenta
5. Removal of retained products of conception (MVA - Manual Vacuum Aspiration)
6. Assisted vaginal delivery (vacuum extraction / forceps)

• Facilities upgraded to First Referral Units (FRUs) to provide CEmOC 24×7
• Janani Suraksha Yojana (JSY) promotes institutional deliveries
• LaQshya programme: Improving quality of care in labour rooms and maternity OTs

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Q112. Essential Obstetric Care (same as above - this appears twice in the list; Q111 and Q112 may refer to "Essential Obs Care" and "Levels of Health Care" respectively)

• First contact point between community and health system
• Sub-centre, PHC, Urban Health Post
• Services: Preventive, promotive, basic curative, referral
• Health workers: ANM, ASHA, MPW, MO-PHC

• District Hospital, Community Health Centre (CHC), Sub-district hospital
• Specialist care (Surgeon, Physician, Gynaecologist, Paediatrician)
• Referral from primary level
• Emergency services, surgeries, investigations

• Medical college hospitals, AIIMS, specialty centres
• Super-specialist care (Cardiology, Neurosurgery, Oncology)
• Teaching and research functions
• Referral from secondary level

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Q113. Levels of Health Care

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Q114. Arthropod Control: Principles (Enumerate)

• Source reduction: Eliminate breeding sites
  • Drain stagnant water, fill depressions
  • Proper solid waste management
  • Anti-larval measures in water bodies
• Habitat modification: Irrigation management, land reclamation

• Use of natural predators/parasites/pathogens of arthropods
• Larvivorous fish (Gambusia, Lebistes) in water bodies - eat mosquito larvae
• Bacillus thuringiensis israelensis (Bti) - biological larvicide
• Bacillus sphaericus
• Copepods (Mesocyclops) for Aedes control

• Larvicides: Temephos (Abate), oils, pyriproxyfen - applied to breeding sites
• Adulticides: DDT, Malathion, synthetic pyrethroids - used in spraying
  • Indoor Residual Spraying (IRS) - for malaria control
  • Space spraying - fogging for Aedes (dengue control)
• Insect Growth Regulators (IGRs): Methoprene - prevent larval maturation

• Bed nets (insecticide-treated nets - ITNs / LLINs for malaria)
• Wire gauze on windows and doors
• Screening of water storage containers
• Protective clothing

• Sterile Insect Technique (SIT): Release of sterile male mosquitoes
• Genetically modified mosquitoes (GM male Aedes releasing refractory genes)

• WHO recommended approach
• Combines multiple methods for effective, sustainable, cost-efficient control
• Evidence-based decision making

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Q115. Biological Effects of Radiation

• Ionizing: X-rays, gamma rays, alpha, beta particles, neutrons
• Non-ionizing: UV, infrared, microwave, radiofrequency

• Haematopoietic syndrome (1-6 Gy): Bone marrow suppression → pancytopenia → infections, bleeding
• Gastrointestinal syndrome (6-10 Gy): Intestinal mucosal destruction → severe diarrhoea, dehydration
• Cerebrovascular syndrome (>10 Gy): CNS oedema → coma, death within hours-days

• Cancer: Leukaemia (first to appear, peak 5-7 years post-exposure), thyroid, lung, breast, bone cancers
• Cataract: Lens opacification (threshold ~2 Gy)
• Life shortening
• Reproductive effects: Temporary or permanent infertility

• Mutations in germ cells → hereditary disorders in offspring
• Gene mutations, chromosomal aberrations
• May not appear for several generations

• First trimester: Organogenesis → most sensitive period
• Microcephaly, mental retardation, growth retardation, congenital malformations
• Childhood cancer (leukaemia) risk increased in prenatally exposed children

• Gray (Gy) = absorbed dose (1 Gy = 100 rad)
• Sievert (Sv) = effective dose (1 Sv = 100 rem)

• Radiation workers: 20 mSv/year (averaged over 5 years)
• General public: 1 mSv/year

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Q116. Sources of Health Information

• Births and deaths registered under Registration of Births and Deaths Act 1969
• Maternal and infant death data
• Cause of death from death certificates
• Quality varies - underregistration is a major problem in India

• Conducted every 10 years (last: 2011 in India)
• Population size, age-sex distribution, literacy, housing, occupation
• Denominator for calculating rates

• National Family Health Survey (NFHS) - every 5 years; fertility, mortality, nutrition, health indicators
• District Level Household Survey (DLHS)
• Annual Health Survey (AHS) - high focus states
• Sample Registration System (SRS) - IMR, CBR, CDR estimates

• Notifiable disease registers (cholera, plague, TB, malaria, etc.)
• Integrated Disease Surveillance Programme (IDSP)
• NVBDCP data (malaria, dengue, filaria)

• In-patient registers, OPD registers, case records
• Hospital Information Systems (HIS)

• Epidemiological studies (surveys, cohort, case-control)
• Operational research

• HMIS (Health Management Information System) - NHM
• ANMOL (ANM Online) - maternal and child health records
• RCH portal, Nikshay (TB), IDSP portal

• WHO, UNICEF, World Bank reports
• Global Burden of Disease study

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Q117. Surveillance: Types

• Routine reporting of cases by health facilities to health authorities
• No active case finding
• Cheap, covers large area
• Disadvantage: Underreporting, delays
• Example: Weekly reporting of malaria cases from PHC

• Active case-finding by health workers (visiting households, examining records)
• More accurate, complete
• Expensive
• Example: Active surveillance during polio eradication; contact tracing for TB

• Systematic collection of data from selected sentinel sites/populations
• Chosen to be representative of a larger population
• Used where complete surveillance is impractical
• Example: HIV sentinel surveillance at ANC clinics, STD clinics; influenza sentinel surveillance

• Monitoring of clinical syndromes (symptoms) before confirmed diagnosis
• Early warning of outbreaks
• Uses: ILI (influenza-like illness) clinics, emergency room data, pharmacy sales
• Example: IDSP's S (Syndromic) component

• Data from laboratory testing for specific pathogens
• Example: Influenza virus surveillance, antimicrobial resistance surveillance

• Monitoring deaths by cause
• Verbal autopsy in community settings

• Monitoring environment for disease agents
• Example: Poliovirus in sewage water (Environmental surveillance for polio)

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Q118. PERT (Programme Evaluation and Review Technique)

• Activity: A task that requires time and resources
• Event: A milestone (start/completion of activity)
• Network diagram: Shows activities (arrows) and events (circles/nodes)
• Critical Path: The longest path through the network - determines minimum project duration

1. Optimistic time (to): Minimum time if everything goes well
2. Pessimistic time (tp): Maximum time if everything goes wrong
3. Most likely time (tm): Most probable time

• Planning immunization campaigns
• Monitoring programme milestones
• Resource scheduling for health projects
• Identifying bottlenecks in programme delivery

• PERT: Probabilistic (uncertain time estimates) - used for research/new programmes
• CPM (Critical Path Method): Deterministic (known time estimates) - used for established programmes

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Q119. Spectrum of Iodine Deficiency Disorders + Social Factors

1. Geography: Inland mountainous/hilly areas (Himalayan belt, Gangetic plains) - soil leached of iodine by glaciation and floods
2. Poverty: Cannot afford iodized salt, poor dietary diversity
3. Food habits: Consumption of goitrogens (cassava, cabbage, cauliflower - contain thiocyanates that block iodine uptake)
4. Low education: Non-compliance with iodized salt usage
5. Traditional practices: Use of non-iodized rock salt or common salt

• Universal Salt Iodization (USI): 15-30 ppm at production
• National Iodine Deficiency Disorders Control Programme (NIDDCP)

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Q120. Malnutrition: Preventive & Social Measures

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Q121. Preventive and Social Measures to Reduce Chromosomal Abnormalities

1. Avoid advanced maternal age pregnancy: Risk of trisomy 21 rises sharply after 35 years → promote family planning and early childbearing
2. Avoid consanguineous marriages: Increases risk of recessive genetic disorders
3. Avoid ionizing radiation during pregnancy: Radiation causes chromosomal breaks
4. Avoid teratogenic drugs/chemicals in pregnancy: Some increase chromosomal abnormality risk
5. Folic acid supplementation: 400-500 μg/day periconceptionally reduces NTDs (chromosomal-related)
6. Rubella vaccination: Before pregnancy; rubella infection in pregnancy causes chromosomal damage
7. Avoid viral infections in first trimester
8. Genetic counselling: For couples with family history of chromosomal disorders, prior affected child, advanced maternal age

1. Maternal serum screening (Triple test / Quadruple test):
   • AFP, hCG, unconjugated estriol ± inhibin A
   • Done at 15-20 weeks; screens for Down syndrome, trisomy 18, NTDs
2. First trimester screening (Combined test):
   • Nuchal translucency (NT) ultrasound + PAPP-A + free β-hCG at 11-13 weeks
3. Non-invasive Prenatal Testing (NIPT): Cell-free fetal DNA in maternal blood
4. Amniocentesis (14-16 weeks): Karyotyping of fetal cells
5. Chorionic Villus Sampling (CVS) (10-12 weeks): Earlier diagnosis
6. Cordocentesis (PUBS): Fetal blood sampling for karyotype

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Q122. Enumerate Modes of Transmission of Disease

• Immediate transfer of agent from reservoir to susceptible host

1. Direct contact: Touching, kissing, sexual intercourse (STIs, syphilis, gonorrhoea)
2. Droplet infection: Large droplets from sneezing/coughing travel <1 metre (influenza, meningococcal meningitis)
3. Transplacental (vertical) transmission: Mother to fetus via placenta (syphilis, rubella, HIV, CMV, toxoplasma - TORCH)
4. Direct inoculation: Bites, scratches, needlestick (rabies, HIV)

1. Vehicle-borne:
   • Water-borne: Cholera, typhoid, hepatitis A, dysentery
   • Food-borne: Salmonella, staphylococcal food poisoning, botulism
   • Milk-borne: Brucellosis, bovine TB, salmonella
   • Fomites (inanimate objects): Contaminated clothes, utensils, soil (tetanus, hookworm)
   • Blood/blood products: HIV, Hepatitis B & C
2. Vector-borne:
   • Mechanical transmission: Vector carries agent on body surface without multiplication (housefly and enteric pathogens)
   • Biological transmission:
     • Propagative: Agent multiplies in vector (plague bacillus in rat flea)
     • Cyclo-propagative: Multiplies and changes form (malaria parasite in Anopheles mosquito)
     • Cyclo-developmental: Changes form but doesn't multiply (filarial worm in Culex mosquito)
     • Trans-ovarial: Passed from mother vector to offspring (rickettsiae in ticks)
3. Airborne:
   • Droplet nuclei: Tiny particles (<5 μm) remain suspended in air for long periods; travel >1 metre (TB, varicella, measles, legionella)
   • Dust: Dried organisms in dust particles (Q fever, histoplasmosis)

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Q123. Methods of Health Communication

1. Health counselling / Advice: Face-to-face; most persuasive; used in clinics, ANM visits
2. Home visits: By health workers (ASHA, ANM); personal, reaches illiterate
3. Bedside teaching / Clinic education

1. Group discussion: Small group (10-20 people); two-way communication; problem-solving; used for village health committees
2. Lecture: Formal presentation to larger group; one-way; less interactive
3. Workshop / Seminar: In-depth learning
4. Role play and demonstration: Shows practical skills (ORS preparation, breastfeeding technique)
5. Panel discussion: Experts discuss topic before audience
6. Symposium: Series of presentations on one topic
7. Buzz session: Divide large audience into small groups; then present back

1. Print media: Posters, pamphlets, leaflets, newspapers, flip charts, health magazines
2. Electronic media: Radio (rural reach), television (IEC campaigns - Pulse Polio, Family Planning), films
3. Digital/Social media: Facebook, WhatsApp, YouTube, SMS - used in NDDCP, COVID-19 campaigns
4. Outdoor media: Hoardings, street plays (nukkad natak), wall paintings, exhibitions

• Flannel boards, flash cards, models, specimens, charts, slides, projectors

• Credibility, context, content, clarity, continuity, channels, capability of audience

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Q124. Consumer Protection Act + Rights of Patients

1. Right to Safety
2. Right to be Informed
3. Right to Choose
4. Right to be Heard
5. Right to Seek Redressal
6. Right to Consumer Education

• Central Consumer Protection Authority (CCPA)
• Product liability provisions
• E-commerce inclusion

• District Consumer Court: Up to Rs. 1 crore (revised 2019)
• State Commission: Rs. 1 crore to Rs. 10 crore
• National Commission: Above Rs. 10 crore

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1. Right to information on healthcare services available - diagnosis and treatment
2. Right to information about professionals involved in care
3. Right to safety from errors and malpractice
4. Right to confidentiality and privacy
5. Right to prompt treatment in an emergency
6. Right to copies of medical records
7. Right to informed consent
8. Right to refuse participation in human experimentation/research
9. Right to be informed about hospital rules and facilities
10. Right to choose and seek second opinion
11. Right to complain and receive compensation

• Consumer Protection Act 1986/2019 (COPRA)
• Indian Medical Council (Professional Conduct, Etiquette and Ethics) Regulations 2002
• Medical Termination of Pregnancy Act (for reproductive rights)
• Pre-Natal Diagnostic Techniques (PNDT) Act 1994

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Q125. Social Goals of Housing

1. Protection from environment: Shelter from rain, wind, cold, heat; protection from vectors and pests
2. Prevention of spread of communicable diseases: Adequate space (prevent overcrowding - risk of TB, respiratory infections); safe water supply; sanitary disposal of excreta
3. Prevention of accidents: Safe construction, adequate lighting, stable staircases
4. Reduction of psychological and social stress: Privacy; personal space; security; sense of belonging and community cohesion
5. Promotion of community life and social cohesion: Common spaces; neighbourhood bonds
6. Connection to essential services: Access to schools, health centres, markets, transport

• Floor area: Minimum 7.5-9.5 sq.m per person
• Ventilation: 1/10th of floor area for windows
• Ceiling height: Minimum 2.75 m
• Safe water supply within 100 m

• Spread of TB, meningococcal disease, influenza
• Mental health problems, domestic violence
• Poor child development

• Pradhan Mantri Awas Yojana (PMAY): Housing for All by 2022 (rural + urban)
• Rajiv Awas Yojana (for slum dwellers)
• Indira Awaas Yojana (rural poor)

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Q126. Statistical Data Presentation

1. Simple table: One characteristic (e.g., age distribution of cases)
2. Cross-tabulation (contingency table): Two or more characteristics (e.g., 2×2 table in epidemiology)
3. Frequency distribution table: Data grouped into class intervals

1. Bar diagram: Simple, multiple, component (stacked) - discrete categories (e.g., immunization coverage by district)
2. Pie chart: Shows proportion/percentage of each category

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Q127. Bias in Epidemiological Research

• Systematic difference in how cases/controls or exposed/unexposed groups are selected
• Types:
  1. Berkson's bias (Hospital admission bias): Hospital patients are not representative of community; sick patients with different combinations of diseases may be over/underrepresented
  2. Prevalence-incidence bias (Neyman's bias): If study includes only survivors, those who died from disease are missed
  3. Diagnostic suspicion bias: More likely to diagnose disease in those with known exposure
  4. Volunteer bias: Volunteers tend to be healthier

• Error in measuring exposure or outcome
• Types:
  1. Recall bias: Cases recall past exposures differently from controls (more common in case-control studies)
  2. Interviewer bias: Interviewer probes more deeply for exposure in cases
  3. Misclassification bias: Incorrectly categorising exposure or disease status
  4. Hawthorne effect: Subjects change behaviour when they know they are being observed

• Not technically a bias but a distortion of the true relationship
• A confounder is associated with both the exposure and the outcome
• Example: Smoking is a confounder in studying alcohol-lung cancer relationship
• Control: Randomization, restriction, matching, stratification, multivariate analysis

• Proper study design
• Randomization (RCTs)
• Blinding
• Standardized data collection methods
• Training of interviewers

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Q128. Logistics & Steps for Education of Group of Villagers Drinking Alcohol

• Venue: Village community hall / Panchayat office / school room
• Timing: Evening (after work hours) or Sunday
• Target audience: Villagers who drink alcohol
• Team: MO-PHC, ASHA, ANM, health educator, Anganwadi worker, village Sarpanch
• Materials: Flip charts, pamphlets (in local language), audiovisual aids, models

• Identify prevalence of alcohol use, pattern, type of alcohol consumed (country liquor, hooch)
• Understand knowledge, attitudes, beliefs, practices (KABP survey)
• Identify community leaders and influential persons

• "To reduce harmful alcohol consumption in the village by X% over Y months"

• Select appropriate method: Group discussion most effective for behavioural change
• Identify key messages: health harms of alcohol, family impact, legal issues, available help
• Use local language and culturally appropriate examples

• Welcome participants; build rapport
• Establish ground rules (non-judgmental, confidential)
• Ice-breaker activity
• Present key facts (briefly) using visual aids
• Facilitate discussion: "What are the problems alcohol causes in your family?"
• Problem-solving: "What can we do?"
• Demonstration: Liver damage model, cost calculation of alcohol spending

• Brief Intervention (BI): FRAMES model - Feedback, Responsibility, Advice, Menu of options, Empathy, Self-efficacy
• Refer heavy drinkers to De-addiction centre / District Mental Health Programme (DMHP)
• Form village-level support group

• Follow-up visits by ASHA
• Evaluate: change in drinking behaviour, hospital admissions, family violence incidents

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Q129. Newborn Screening Tests

• RBSK (Rashtriya Bal Swasthya Karyakram) - screens children 0-18 years for 4Ds: Defects at birth, Deficiencies, Diseases, Developmental delays
• National programme does not yet have universal newborn metabolic screening; pilot studies ongoing

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Q130. Growth Charts and Uses

• WHO Child Growth Standards 2006 (0-5 years): Based on children raised in optimal conditions worldwide; adopted by India
• Indian Academy of Pediatrics (IAP) Growth Charts (2015): Used for 5-18 years

1. Weight-for-Age
2. Length/Height-for-Age
3. Weight-for-Length/Height
4. BMI-for-Age (for older children)
5. Head circumference-for-Age (0-5 years)

1. Monitoring individual child growth: Track growth trajectory; identify faltering
2. Early identification of malnutrition:
   • Stunting: Low Height-for-Age (chronic malnutrition)
   • Wasting: Low Weight-for-Height (acute malnutrition)
   • Underweight: Low Weight-for-Age
   • SAM (Severe Acute Malnutrition): WHZ <-3 SD or MUAC <11.5 cm or presence of bilateral pitting oedema
3. Road to Health Chart: Used in ICDS/AWC - plots weight-for-age monthly; any weight loss or plateau triggers action
4. Programme monitoring: Track community nutritional status trends
5. Research: Population nutrition surveillance
6. Identification of overweight/obesity: BMI-for-age >+2 SD

• <11.5 cm = SAM; 11.5-12.5 cm = MAM; >12.5 cm = Normal (in 6-59 months)
• Simple field tool for community-based screening

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Q131. Concept of Well-Being

1. Physical well-being: Freedom from disease, adequate nutrition, physical fitness, energy, vitality
2. Mental/Psychological well-being: Emotional stability, ability to cope with stress, positive self-concept, happiness, purpose in life
3. Social well-being: Satisfying social relationships, social support networks, sense of belonging, ability to fulfill social roles
4. Spiritual well-being: Sense of meaning and purpose, hope, transcendence (increasingly recognized)
5. Occupational well-being: Satisfaction with work, work-life balance
6. Economic well-being: Financial security, freedom from poverty

• Subjective Well-Being (SWB) questionnaires
• WHOQOL (World Health Organization Quality of Life) instrument
• WHO-5 Well-Being Index
• Happiness Index / Gross National Happiness (GNH) - Bhutan model

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Q132. DALY (Disability Adjusted Life Year)

• YLL (Years of Life Lost due to premature mortality): YLL = number of deaths × standard life expectancy at age of death (Japanese life expectancy used as global standard)
• YLD (Years Lived with Disability): YLD = number of incident cases × duration of disease × disability weight (Disability weight: 0 = perfect health; 1 = dead)

1. Measures combined impact of premature death AND disability
2. Allows comparison of disease burden across different diseases and countries
3. Captures impact of non-fatal conditions (psychiatric disorders)
4. Guides health policy and resource allocation
5. Example: 1990 WHO report showed 5 of 10 leading causes of disability were psychiatric (depression, schizophrenia, bipolar) - not apparent from mortality data alone

• 1 DALY = 1 year of healthy life lost
• Lower DALYs = healthier population
• Social weighting: Years as young adult valued more (reflects productivity)

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Q133. Migration Studies and Their Importance

• Japanese migrants to Hawaii and California develop higher rates of CHD and colon cancer than Japanese in Japan → suggests environmental (dietary) factors more important than genetic factors

• Migrant studies of cancer, CVD, diabetes help distinguish environmental exposures from inherited susceptibility

• As migrants adopt host country's lifestyle (diet, smoking, physical activity), their disease pattern shifts toward host country patterns

• Migrant worker health: Increased risk of TB (India's migrant workers), HIV, occupational diseases
• Internal migration (rural to urban): Urbanization and NCD risk
• Reverse migration: Return of migrants with diseases (COVID-19, TB)

• Migrants act as a "natural experiment" separating genetic and environmental effects

• South Asians in UK: High CHD rates despite lower fat diet (suggests genetic susceptibility + lifestyle interaction)
• ICMR migrant studies: Migrants from rural to urban India show rising diabetes/hypertension rates

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Q134. Passive Immunity

1. Transplacental: IgG antibodies cross placenta from mother to fetus (most important)
   • Provides protection for first 3-6 months of life against: diphtheria, tetanus, measles, polio, whooping cough
   • This is why infants are not immediately susceptible to many infections
2. Via colostrum/breast milk: Secretory IgA in breast milk protects GI and respiratory mucosa of infant
   • Also contains IgM, lymphocytes, macrophages, lactoferrin

1. Immunoglobulins (specific/non-specific):
   • Normal Human Immunoglobulin (NHIG): Hepatitis A, measles prophylaxis
   • Specific immunoglobulins: Tetanus immunoglobulin (TIG), Rabies immunoglobulin (RIG), Hepatitis B immunoglobulin (HBIG), Varicella-zoster immunoglobulin (VZIG)
2. Antitoxins/Antisera:
   • Antidiphtheria serum (ADS), Antitetanus serum (ATS) - horse-derived
   • Risk of serum sickness, anaphylaxis with horse serum

• Onset: Immediate (hours)
• Duration: Short (3 weeks to 3-4 months)
• No memory cells formed
• Used when immediate protection needed (post-exposure)

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Q135. Role of Millets in Undernutrition

• Sorghum (Jowar), Pearl millet (Bajra), Finger millet (Ragi/Nachni), Foxtail millet, Kodo millet, Little millet, Barnyard millet

1. Iron deficiency anaemia: Bajra, ragi → high iron content
2. Calcium deficiency/Rickets: Ragi (highest calcium among cereals)
3. Protein energy malnutrition: Good protein source for complementary feeding
4. Hidden hunger (micronutrient deficiency): Multiple micronutrients in one grain
5. Complementary feeding: Ragi porridge (ambali/kanji) - traditional weaning food in South India
6. Food security: Grows in poor soil, low rainfall - ensures food availability in drought-prone areas

• POSHAN Abhiyan includes millets as part of dietary diversity promotion
• Odisha Millet Mission
• PM POSHAN (midday meals) incorporate millets

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Q136. Hidden Hunger

• Person may appear well-nourished or even overweight
• Deficiencies are "hidden" - not obvious to the naked eye
• Affects health, growth, cognitive development, immunity
• Affects over 2 billion people worldwide (WHO)
• India has a huge hidden hunger burden ("triple burden of malnutrition")

• Impaired cognitive development, poor school performance
• Increased susceptibility to infections, higher child mortality
• Poor pregnancy outcomes (LBW, preterm)
• Reduced work capacity, economic productivity loss

1. Dietary diversification (consume multiple food groups)
2. Food fortification (iodized salt, fortified rice, oil, flour)
3. Supplementation (IFA, Vitamin A, Zinc + ORS)
4. Biofortification (breed crops with higher micronutrient content - iron rice, Vitamin A banana, zinc wheat)
5. Nutrition education and behaviour change
6. National programmes: Anaemia Mukt Bharat, NIDDCP, VAS programme

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Q137. Control of Scabies Spread

• Permethrin 5% cream (drug of choice): Applied to entire body from neck down; washed after 8-12 hours; repeat after 1 week
• Benzyl benzoate 25% (alternative): Applied for 24 hours; repeated on 2nd and 3rd day
• Ivermectin 200 μg/kg oral: Single dose; used in crusted (Norwegian) scabies, mass treatment
• Sulfur ointment 6-10%: Cheap, safe in pregnancy and infants

• All household members and close contacts must be treated simultaneously (most important principle) to prevent reinfection
• Even asymptomatic contacts should be treated

• Wash all clothing, bed linen, towels in hot water (>50°C) and dry in hot sun
• Items that cannot be washed: Seal in plastic bag for 72 hours (mites die without human host)

• Improve hygiene and sanitation
• Reduce overcrowding (overcrowding is the main risk factor for spread)
• Avoid sharing clothes, bedding, towels

• Mass drug administration with Ivermectin for outbreak control in prisons, camps, endemic communities

• Recognize early lesions (intense nocturnal itching, burrows in finger webs, wrists, genitalia)
• Seek early treatment; avoid scratching and secondary bacterial infection (impetigo)

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Q138. ER, AR, Population AR - Formula and Importance

• Measures the excess risk of disease in exposed persons attributable to the exposure
• Formula: AR = Ie - Iu
  • Ie = Incidence rate in exposed
  • Iu = Incidence rate in unexposed

• Indicates how much of the disease in exposed individuals is due to the exposure
• Guides individual-level prevention

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• Proportion of disease in exposed that is attributable to the exposure
• Formula: AR% = [(Ie - Iu) / Ie] × 100 = [(RR - 1) / RR] × 100

• Tells what proportion of disease in exposed could be eliminated if exposure were removed

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• The excess rate of disease in the entire population (exposed + unexposed) attributable to the exposure
• Formula: PAR = Ip - Iu
  • Ip = Incidence in total population
  • Iu = Incidence in unexposed

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• Formula: PAR% = [(Ip - Iu) / Ip] × 100

• Pe = Prevalence of exposure in population

• Most important measure for public health decisions
• Tells what proportion of all cases in the community could be prevented if the exposure were eliminated
• Depends on both the strength of association (RR) AND the prevalence of exposure in the population
• Example: Smoking and lung cancer - even though RR is very high, if smoking prevalence is low, PAR% is lower

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Q139. Levels of Communication Between Doctor and Patient

• Within the individual's mind (self-talk, reflection)
• Doctor's own thinking about diagnosis; patient's internal processing of illness

• Direct face-to-face interaction between doctor and patient
• Most important level in clinical medicine
• Components: verbal (words), non-verbal (body language, eye contact, touch), and listening
• Types:
  • Information giving: Explaining diagnosis, treatment
  • History taking: Active listening, open-ended questions
  • Counselling: Empathy, advice, behaviour change support
  • Informed consent: Explaining procedures and risks

• Doctor addressing patient's family, or a group of patients (e.g., diabetic education group)

• Doctor using mass media (TV, newspaper, radio) for health education to large populations

• Language differences, medical jargon, low health literacy
• Time constraints, authoritarian attitude
• Patient anxiety, fear, denial
• Cultural barriers

• Active listening (SOLER: Sit squarely, Open posture, Lean forward, Eye contact, Relax)
• Open-ended questions
• Empathy and non-judgmental attitude
• Simple, clear language (avoid jargon)
• Teach-back method (ask patient to repeat understanding)

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Q140. Great Sanitary Awakening

1. Edwin Chadwick (1842): "Report on the Sanitary Condition of the Labouring Population of Great Britain" - demonstrated link between poor sanitation, overcrowding, poverty and disease
2. John Snow (1854): Cholera investigation in Broad Street, London → removed pump handle → pioneered epidemiology and waterborne disease concept
3. William Farr: Developed vital statistics; analyzed death rates by occupation, region
4. Florence Nightingale: Sanitary reform in hospitals; statistical evidence on hospital hygiene reducing mortality
5. Public Health Act (1848) UK: First major public health legislation; created General Board of Health

• Shift from fatalism to recognition that disease can be prevented
• Environmental sanitation (clean water, sewage disposal, housing) → dramatic decline in mortality from cholera, typhoid, dysentery
• Preceded Pasteur's germ theory (1860s) and Koch's postulates (1880s)
• Led to establishment of modern public health as a discipline
• Demonstrated the power of social and environmental determinants of health

• British colonial public health measures in India: sanitation in military cantonments, plague committees, water supply improvement post-1857 rebellion

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Q141. Epidemic Curve

1. Determines the type of epidemic (common source vs propagated)
2. Helps identify the time of exposure (work back from median incubation period)
3. Indicates the status of epidemic (rising, peak, declining)
4. Suggests the mode of transmission

• All cases exposed at the same time to a common source
• Epidemic curve: Rapid rise, single sharp peak, rapid fall
• Duration covers 1-2 incubation periods
• Example: Food poisoning at a wedding feast; outbreak from one contaminated water source

• Exposure to contaminated source continues over prolonged period
• Epidemic curve: Gradual rise, plateau, gradual decline when source eliminated
• Example: Contaminated water supply over several weeks

• Disease spreads from person to person through secondary cases
• Epidemic curve: Series of successive waves; each wave 1 incubation period apart
• Gradual rise, multiple peaks
• Example: Measles, influenza, COVID-19

• Combination of common source + propagated
• Initial sharp peak (common source), followed by further cases (person-to-person)
• Example: Typhoid starting from contaminated water, then spreading by contact

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Q142. Septic Tank

• Material: Brick masonry, concrete, or ferrocement
• Capacity: 1000 litres minimum for 5-person household
• Two-chamber design preferred (better settling)
• Dimensions: Length:Breadth = 4:1 (or 3:2); depth 1.5-1.8 m
• Inlet: T-shaped pipe opening below liquid surface (prevents scum disturbance)
• Outlet: T-shaped pipe at effluent level
• Access manhole: For inspection and desludging

1. Sewage enters → sedimentation of solids
2. Anaerobic bacteria digest sludge → produces biogas (CH₄, CO₂, H₂S)
3. Effluent flows to soak pit (sub-surface absorption trench)
4. Sludge accumulates → desludge every 2-3 years

• No odour (if properly maintained)
• No electricity required
• Suitable for individual homes in areas without sewerage system
• Low cost, low maintenance

• Does NOT fully treat sewage (effluent still has pathogens)
• Requires adequate soil permeability for soak pit
• Must be located >15 m from water source to prevent contamination
• Regular desludging needed

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