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DETAILED ANSWERS - K PARK'S TEXTBOOK OF PSM

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Q60. COLD CHAIN EQUIPMENT, SYSTEM + OPEN VIAL POLICY + REVERSE COLD CHAIN

• Vaccines sensitive to freezing (store at +2°C to +8°C): Cholera, DTwP, Hepatitis B, IPV, HPV, Influenza
• Vaccines sensitive to heat: OPV is the most heat-sensitive (stored at -15°C to -25°C)
• Freeze-dried vaccines lose potency rapidly after reconstitution

• At national/state level: Walk-in coolers (WIC), Walk-in freezers (WIF)
• At district level: Ice-lined refrigerators (ILR), Deep freezers
• At PHC level: ILR, deep freezers, vaccine carrier, cold box
• Cold box: For transport; maintains temperature for 48-72 hours
• Vaccine carrier: Maintains temperature for 6-8 hours
• Ice packs: Used in vaccine carriers and cold boxes

1. Cold chain is maintained
2. Vial is not contaminated
3. Vaccine has not passed its expiry date
4. VVM (Vaccine Vial Monitor) has not reached discard point Vaccines covered: OPV, BCG, DPT, Hepatitis B, TT, DT (NOT applicable to measles-containing vaccines once opened)

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Q61. FOOD FORTIFICATION + ADULTERATION + PFA ACT

• Fortification: Addition of nutrients not naturally present
• Enrichment: Restoring nutrients lost during processing
• Supplementation: Adding nutrients beyond natural level

• Iodized salt (iodine added)
• Vanaspati/margarine fortified with Vitamin A and D
• Flour fortified with iron and folic acid
• Double-fortified salt (iron + iodine)
• Milk fortified with Vitamin D

• Mustard oil + argemone oil → epidemic dropsy
• Milk + water or starch
• Turmeric + lead chromate
• Chilli powder + brick powder
• Cooking oil + mineral oil

• Defines "adulterated food" and "misbranded food"
• Empowers food inspectors to take samples
• Punishment: 6 months to life imprisonment depending on offence
• Central Food Laboratory (CFL) established for analysis
• Replaced by Food Safety and Standards Act (FSSA), 2006 - the current legislation
• FSSA created FSSAI (Food Safety and Standards Authority of India)

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Q62. SOCIAL MARKETING

• Uses 4 Ps: Product, Price, Place, Promotion
• Aims at behavior change for social benefit
• Target audience: general population or specific group

• Condom social marketing programmes (e.g., Nirodh brand)
• ORS social marketing
• Iron and folic acid distribution
• Anti-tobacco campaigns

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Q63. TYPES OF REHABILITATION + COMMUNITY BASED REHABILITATION (CBR)

1. Medical Rehabilitation: Restoration of function through medical/surgical treatment, physiotherapy
2. Vocational Rehabilitation: Training for employment; covered under Persons with Disabilities Act
3. Social Rehabilitation: Reintegration into society; includes removal of social barriers
4. Educational Rehabilitation: Special education for disabled children
5. Psychological Rehabilitation: Counseling, psychiatric support

• Low cost
• Utilizes local resources
• Covers larger population
• Culturally appropriate
• Sustainable

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Q64. DIETARY FIBRE

• Soluble fibre: Pectin, gums, mucilages - found in fruits, legumes, oats; reduces cholesterol and blood glucose
• Insoluble fibre: Cellulose, lignin - found in wheat bran, vegetables; adds bulk, speeds transit

• Prevents constipation
• Reduces colorectal cancer risk
• Lowers serum cholesterol (LDL)
• Improves glycemic control in diabetes
• Promotes satiety - helps in obesity
• Prevents diverticular disease and piles

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Q65. LATHYRISM (Neurolathyrism) ★★★

1. Latent stage: Apparently healthy; abnormal gait on stress; neurological signs present; reversible if pulse withdrawn
2. No-stick stage: Walks with short jerky steps without aid
3. One-stick stage: Needs one stick to walk
4. Two-stick stage: Needs two sticks/support
5. Creeper stage: Crawls on hands and knees

• Avoid consuming >30% Lathyrus in diet
• Soak in hot water, discard water before cooking
• Growing low-toxin varieties
• Banning/restricting sale
• Nutritional supplementation (methionine)
• Health education

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Q66. OCCUPATIONAL HAZARDS + AGRICULTURAL WORKERS + PPE

1. Physical hazards: Noise (>90 dB → noise-induced deafness), vibration, extreme temperatures (heat stroke, frostbite), radiation (ionizing/non-ionizing), poor lighting
2. Chemical hazards: Dust diseases (pneumoconioses), toxic metals (lead, mercury, arsenic), solvents, gases (CO poisoning), agrochemicals
3. Biological hazards: Anthrax (wool sorters), brucellosis (farm workers), leptospirosis, rabies
4. Mechanical/ergonomic hazards: Accidents, musculoskeletal disorders, repetitive strain injuries
5. Psychosocial hazards: Stress, burnout, shift work disorders

• Pesticide/insecticide poisoning (organophosphate toxicity)
• Zoonoses (anthrax, brucellosis, hydatid disease, leptospirosis)
• Dust diseases (farmer's lung from hay dust - hypersensitivity pneumonitis)
• Byssinosis (cotton workers), Bagassosis (sugarcane)
• Snake bites
• Heat stroke during summer
• Ergonomic hazards from prolonged bending
• Accidents from farm machinery

• Gloves, boots, masks/respirators
• Safety goggles
• Protective clothing
• Hearing protection (ear muffs, plugs) for >85 dB noise

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Q67. ANTI-RODENT MEASURES + RODENT-TRANSMITTED DISEASES

• Plague (via fleas from rats)
• Murine typhus (Rickettsia typhi)
• Leptospirosis (via rat urine)
• Rat bite fever (Spirillum minus, Streptobacillus)
• Scrub typhus
• Salmonellosis (food contamination)
• Hantavirus pulmonary syndrome

1. Rat proofing: Building construction to prevent entry; cement floors, metal strips on doors
2. Environmental sanitation: Proper garbage disposal, eliminate harborages
3. Poisoning (Rodenticides):
   • Anticoagulants: Warfarin (most commonly used, slow-acting); Brodifacoum
   • Acute poisons: Zinc phosphide, ANTU
4. Trapping: Mechanical traps, live traps
5. Fumigation: Methyl bromide in ships/warehouses
6. Biological control: Cats, natural predators
7. Fumigation of rat burrows: Calcium cyanide

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Q68. TOOLS OF EPIDEMIOLOGY

1. Descriptive Epidemiology: Person, place, time distribution
2. Analytical studies: Case-control, cohort studies
3. Experimental studies: RCTs, field trials
4. Surveillance: Ongoing systematic collection of data
5. Screening: Presumptive identification of unrecognized disease
6. Epidemic investigation: Shoe-leather epidemiology
7. Statistical methods: Rates, ratios, proportions; significance tests
8. Causation tools: Web of causation, Koch's postulates, Bradford Hill criteria
9. Case definition
10. Demographic tools: Census, vital statistics

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Q69. F/O (FATHER OF) INDIAN SURGERY - CONTRIBUTION

• Described 300 surgical procedures and 120 surgical instruments
• Pioneered rhinoplasty (reconstructive surgery of the nose)
• Described cataract operations
• Described lithotomy (removal of urinary stones)
• Described classification of diseases
• Used cauterization and ligation for wound management

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Q70. ACCIDENTS IN INDUSTRY + PRE-PLACEMENT EXAMINATION

• Unsafe acts (85%): Working without authority, failure to use PPE, unsafe speed
• Unsafe conditions (15%): Defective equipment, poor housekeeping, inadequate guarding

1. Engineering controls: Machine guarding, safe design
2. Administrative controls: Training, supervision, safety protocols
3. PPE
4. Pre-placement and periodic medical examinations
5. Safety committees (mandatory under Factories Act for >500 workers)
6. Accident reporting and investigation

1. Assess fitness for the specific job
2. Detect pre-existing conditions that may be aggravated by work
3. Establish baseline health data
4. Protect employer from false compensation claims
5. Medico-legal protection

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Q71. CLASSIFICATION OF EPIDEMIOLOGICAL STUDIES + TYPES OF EPIDEMICS + SECULAR TREND

1. Descriptive: Cross-sectional surveys, case reports, case series, ecological studies
2. Analytical:
   • Cross-sectional (prevalence study): Snapshot; measures prevalence; cannot establish causality
   • Case-control (retrospective): Compares cases vs controls; uses Odds Ratio; good for rare diseases
   • Cohort (prospective/retrospective): Follows exposed vs unexposed; uses Relative Risk; best for establishing causality; long and expensive

1. RCT (Randomized Controlled Trial) - gold standard
2. Field trials
3. Community trials
4. Natural experiments

1. Common source epidemic:
   • Point source: All exposed at same time and place; sharp peak on epidemic curve (e.g., food poisoning)
   • Continuous/prolonged source: Exposure over extended period; plateau on curve
   • Intermittent source: Irregular peaks
2. Propagated (progressive) epidemic: Person-to-person spread; gradual rise and fall; successive waves (e.g., measles, chickenpox)
3. Mixed epidemic: Starts as common source, then propagated

• Decline of TB mortality over decades
• Rise in cardiovascular diseases
• Rising trend of type 2 diabetes Used to: assess natural history, evaluate control programs, plan health services.

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Q72. SCREENING TEST - VALIDITY, CRITERIA, EVALUATION, TYPES, USES

1. Sensitivity: Ability to correctly identify true positives (TP/TP+FN x100). A test with high sensitivity has few false negatives. Used when missing disease is costly.
2. Specificity: Ability to correctly identify true negatives (TN/TN+FP x100). High specificity = few false positives. Used when false positives are costly.
3. Predictive Value Positive (PVP): TP/TP+FP - probability that a positive test truly has disease
4. Predictive Value Negative (PVN): TN/TN+FN

1. The condition sought should be an important health problem
2. Natural history of condition should be understood
3. There should be a recognizable early or latent stage
4. Treatment at early stage should be more beneficial than late
5. A suitable test/examination should be available
6. Test should be acceptable to the population
7. Agreed policy on whom to treat
8. Diagnosis and treatment facilities available
9. Established cost-benefit analysis
10. Case-finding should be continuous

• Mass screening: whole population
• Selective (targeted): high-risk groups
• Multiphasic: multiple tests simultaneously
• Opportunistic: during routine clinical visits
• Case-finding: in known contacts

• Yield: number of previously undiagnosed cases found
• Lead time bias: apparent survival improvement due to earlier detection
• Length bias: preferential detection of slow-progressing disease
• Overdiagnosis bias

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Q73. COMMUNITY NUTRITION PROGRAMMES IN INDIA - ICDS, OBJECTIVES, SERVICES

• Children 0-6 years
• Pregnant women
• Lactating mothers

1. Improve nutritional and health status of children 0-6 years
2. Lay foundation for proper psychological, physical and social development
3. Reduce incidence of mortality, morbidity, malnutrition and school dropout
4. Achieve effective coordination of policy and implementation among departments
5. Enhance capability of mothers to look after normal health and nutritional needs of the child
6. Create awareness about child care and development

1. Supplementary nutrition
2. Immunization
3. Health check-up
4. Referral services
5. Pre-school non-formal education
6. Nutrition and health education (to mothers)

• Mid-Day Meal Scheme (MDMS)/PM POSHAN: Children in government schools
• National Nutrition Mission (POSHAN Abhiyaan): Launched 2018; target to reduce stunting, undernutrition, anemia
• Pradhan Mantri Matru Vandana Yojana (PMMVY): Cash incentive for pregnant/lactating women

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Q74. PRENATAL DIAGNOSIS

1. Non-invasive:
   • Ultrasonography (structural defects, nuchal translucency for Down syndrome)
   • Maternal serum screening: Triple test (AFP, hCG, unconjugated estriol) - Down syndrome risk
   • Quad screen (+ inhibin A)
   • Cell-free fetal DNA (NIPT) - non-invasive prenatal testing
2. Invasive:
   • Amniocentesis (15-18 weeks): Amniotic fluid for karyotyping; risk of miscarriage ~0.5%
   • Chorionic Villus Sampling (CVS) (10-12 weeks): Earlier than amniocentesis; miscarriage risk ~1%
   • Cordocentesis (PUBS): Fetal blood sampling; used for rapid karyotyping

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Q75. GROUP DISCUSSION (as a method of health education)

• Two-way communication
• Encourages participation
• Changes attitudes and behaviors
• Leader (facilitator) does NOT dominate
• Group size: 8-15 people

• Promotes active participation
• Changes attitudes effectively
• Members learn from each other
• Generates new ideas

• Time-consuming
• Requires skilled facilitator
• Limited reach

1. Select group members
2. Choose topic
3. Leader introduces topic
4. Open discussion
5. Summarize and conclude

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Q76. HEALTH TEAM CONCEPT

• Medical Officer (team leader)
• Health Worker Female (ANM/HW-F)
• Health Worker Male (MPW-M)
• Health Supervisor
• Lady Health Visitor (LHV)
• Pharmacist, Lab Technician
• Dentist, Ophthalmic Assistant

• Clear leadership
• Defined roles and responsibilities
• Good communication
• Mutual respect and trust
• Common goal

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Q77. ICEBERG PHENOMENON ★★★

• Clinical (diagnosed) cases
• Reported cases

• Undiagnosed clinical cases
• Subclinical/inapparent infections
• Carriers (healthy carriers, incubatory carriers, convalescent carriers)
• Latent infections
• "At risk" individuals

• The hidden mass is the source of infection and represents the reservoir
• Explains why control efforts based only on diagnosed cases fail
• Applies to both communicable diseases (e.g., polio, TB) and non-communicable diseases (e.g., hypertension, diabetes - many undiagnosed)
• Shows the need for active case finding, surveillance, and screening

• Polio: 1 case of paralytic polio → 100-200 subclinical infections
• TB: Many undiagnosed cases
• Hypertension: "Rule of Halves" - half undiagnosed, half untreated, half of treated uncontrolled

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Q78. SCREENING vs DIAGNOSTIC TEST

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Q79. PQLI (Physical Quality of Life Index) ★★★★★

1. Infant mortality rate (per 1000 live births)
2. Life expectancy at age 1
3. Basic literacy rate (%)

• Proposed by Morris David Morris in 1979
• Does NOT include per capita GNP (shows "money is not everything")
• Measures results of policies, not inputs
• Oil-rich Middle Eastern countries have high GNP but not proportionally high PQLI
• Kerala and Sri Lanka: low per capita income but high PQLI
• Complements (does not replace) GNP

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Q80. SENSITIVITY AND SPECIFICITY

• = TP / (TP + FN) × 100
• Ability of a test to correctly identify true positives (diseased persons with positive test)
• A highly sensitive test has few false negatives
• Used when: missing disease is dangerous/costly (e.g., HIV screening, cancer screening)
• "SnNout" - Sensitive test: Negative result rules OUT disease

• = TN / (TN + FP) × 100
• Ability to correctly identify true negatives (healthy persons with negative test)
• High specificity = few false positives
• Used when: false positive would cause harm/anxiety
• "SpPin" - Specific test: Positive result rules IN disease

• PVP = TP/(TP+FP) - depends on prevalence
• PVN = TN/(TN+FN) - depends on prevalence
• Higher prevalence → higher PVP

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Q81. BREAKPOINT CHLORINATION ★★

• To achieve adequate disinfection, chlorine must be added beyond the breakpoint
• Required free residual chlorine: 0.2 mg/L (0.2 ppm) after 30 minutes contact time
• In practice, dose above breakpoint is added to maintain a free chlorine residual of 0.2 ppm

1. Zone 1: Chlorine reacts with reducing substances - no residual
2. Zone 2: Chloramines form - combined residual chlorine appears
3. Trough (breakpoint): Chloramines are destroyed - residual falls to near zero
4. Zone 3: Beyond breakpoint - free residual chlorine increases proportionally

• Ensures bactericidal efficacy
• Used to calculate correct chlorine dose for water treatment
• Free chlorine is more germicidal than combined chlorine (chloramines)

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Q82. CLASSIFICATION OF DUST DISEASES + BYSSINOSIS + BAGASSOSIS

• Silica → Silicosis (most important; 2-5 years exposure; egg-shell calcification on X-ray)
• Coal → Anthracosis (coal workers' pneumoconiosis)
• Asbestos → Asbestosis + mesothelioma + bronchogenic carcinoma
• Iron → Siderosis
• Beryllium → Berylliosis

• Cane fibre (bagasse) → Bagassosis
• Cotton dust → Byssinosis
• Hay/grain dust → Farmer's lung
• Tobacco → Tobaccosis

• Caused by inhalation of cotton dust (also hemp, flax, jute)
• "Monday fever" - symptoms worst on Monday after weekend rest; improve during the week
• Classic symptom: chest tightness and breathlessness on Mondays
• Progressive: eventually permanent respiratory impairment
• Prevention: dust suppression, PPE, pre-employment spirometry

• Caused by inhalation of sugarcane fibre (bagasse) dust - specifically moldy/dried bagasse
• Type III hypersensitivity reaction (extrinsic allergic alveolitis / hypersensitivity pneumonitis)
• Features: fever, cough, breathlessness 4-8 hours after exposure
• Seen in workers processing sugarcane waste (paper mills)
• Prevention: wetting bagasse, PPE

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Q83. CLASSIFICATION OF HEALTH COMMUNICATION + GROUP APPROACH + MASS APPROACH

1. Individual (Interpersonal) approach: One-on-one; most effective for behavior change; e.g., clinical counseling, home visits
2. Group approach: Group education; moderate reach; allows two-way communication
3. Mass (community) approach: Reaches large numbers; one-way; e.g., radio, TV, posters

• Lecture (one-way but reaches multiple)
• Group discussion (most effective - two-way)
• Symposium, Panel discussion, Workshop, Seminar
• Role play, Drama, Demonstrations

• Mass media: Television, Radio, Newspapers
• Print media: Posters, pamphlets, flip charts
• Folk media: Puppet shows, street plays, folk songs
• Social media (modern)

• Language barriers
• Cultural barriers
• Noise and distance
• Illiteracy
• Wrong channel selection

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Q84. GERM THEORY OF DISEASE

• Louis Pasteur: Discovered microorganisms; developed pasteurization and vaccines (rabies, anthrax, cholera)
• Robert Koch: Developed Koch's Postulates (1884); discovered M. tuberculosis, V. cholerae, anthrax bacillus
• Joseph Lister: Antiseptic surgery based on germ theory
• Ignaz Semmelweis: Handwashing to prevent puerperal fever

1. The organism must be found in all cases of the disease
2. It must be isolated from the diseased host and grown in pure culture
3. The cultured organism must cause disease when introduced into a healthy host
4. The organism must be re-isolated from the experimentally diseased host

• Not all exposed individuals develop disease (role of host)
• Single cause insufficient for most chronic diseases
• Replaced by Multifactorial causation and Web of Causation models

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Q85. THE SICK ROLE ★★★★ (Parsons)

1. The sick person is exempted from normal social responsibilities (proportional to severity of illness)
2. The sick person is not held responsible for being sick (illness is seen as involuntary)
3. The sick person must want to get well - sickness is considered undesirable; role is temporary
4. The sick person is obligated to seek technical competent help (consult a doctor) and cooperate with treatment

• Normal illness behavior
• Abnormal illness behavior (hypochondriasis, malingering, somatization)

• Does not apply to chronic illness (can't always "want to get well" and be cured)
• Doesn't account for power imbalance between doctor and patient
• Culturally variable
• Ignores patient's own role in causation (lifestyle)

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Q86. SCREENING - DEFINITION, USES ★★★

• Simple, quick, cheap
• Safe with few side effects
• Acceptable to the population
• High sensitivity (to identify all likely cases)

1. To detect disease early for timely treatment
2. To study natural history and extent of disease
3. To provide information for disease control
4. To estimate disease burden in community
5. Research purposes
6. Medico-legal purposes

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Q87. HARD TICK vs SOFT TICK

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Q88. TYPES OF FAMILY

1. Nuclear family: Husband, wife and their children
2. Extended (joint) family: Nuclear family + other relatives (grandparents, siblings, in-laws)
3. Three-generation family: Grandparents + parents + children
4. Single-parent family: One parent + children

• Monogamy (one spouse)
• Polygamy: Polygyny (one man, many wives), Polyandry (one woman, many husbands)

• Patrilineal (through father's line)
• Matrilineal (through mother's line)

• Patrilocal, Matrilocal, Neolocal (new home)

• Reproductive function
• Socialization of children
• Economic support
• Care of the sick and elderly
• Emotional support

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Q89. WATER-BORNE DISEASES (ENLIST) + RAPID SAND FILTRATION

• Cholera (Vibrio cholerae)
• Typhoid (Salmonella typhi)
• Paratyphoid (S. paratyphi)
• Bacillary dysentery (Shigella)
• E. coli diarrhea
• Leptospirosis

• Hepatitis A
• Hepatitis E
• Poliomyelitis

• Amoebic dysentery (E. histolytica)
• Giardiasis (Giardia lamblia)
• Cryptosporidiosis

• Guinea worm (Dracunculiasis)
• Ascariasis, Hookworm

• Rate: 5-15 m³/m²/hour (vs 0.1-0.4 m³/m²/hour for slow sand)
• Requires prior coagulation-sedimentation (with alum) - cannot handle turbid water alone
• Cleaning: Backwashing every 24-72 hours (not manual scraping like slow sand)
• Depth of sand: ~75 cm (less than slow sand)
• Does NOT produce bacterially safe water alone - must be followed by chlorination
• Advantage: Faster, handles higher flow, suitable for large cities

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Q90. DEPROFESSIONALISATION OF MEDICINE

• Rise of educated, informed patients (internet access)
• Alternative medicine and traditional healers gaining legitimacy
• Health being seen as a right, not a privilege
• Consumer movements and patient rights
• Rising litigation against doctors
• Media scrutiny of medical profession
• Corporate/insurance control of medical practice

1. Clinical iatrogenesis: Harm from treatment itself (side effects, surgical errors)
2. Social iatrogenesis: Medicalization of life (normal processes like pregnancy, aging treated as diseases)
3. Cultural iatrogenesis: Medicine undermining people's ability to manage their own health

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Q91. ISOLATION vs QUARANTINE + EMPORIATRICS ★★★

• Strict isolation (airborne + contact)
• Respiratory isolation
• Enteric isolation
• Blood/body fluid precautions
• Protective (reverse) isolation - for immunocompromised

• (a) Absolute/complete quarantine: Complete limitation of freedom of movement
• (b) Modified quarantine: Selective partial limitation (e.g., exclusion of children from school)
• (c) Segregation: Separation of a part of a group for special observation/control

• Pre-travel vaccinations (Yellow fever - mandatory for Africa/South America; Hepatitis A, Typhoid)
• Malaria chemoprophylaxis
• Traveler's diarrhea prevention
• Jet lag management
• DVT prevention in long flights
• Altitude sickness
• Medical kit preparation

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Q92. NATIONAL MENTAL HEALTH PROGRAMME (NMHP) - AIMS AND OBJECTIVES

1. Prevention and treatment of mental and neurological disorders and their associated disabilities
2. Use of mental health technology to improve general health services
3. Application of mental health principles in total national development

1. Ensure availability and accessibility of basic mental health care to all
2. Encourage application of mental health knowledge in general health care
3. Promote community participation in mental health services
4. Stimulate efforts toward self-help in communities

• District Mental Health Programme (DMHP) - launched 1996
• Integration with primary health care
• Community awareness
• Training of PHC staff

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Q93. DIETARY GOALS

1. Total fat: 15-30% of total energy
2. Saturated fat: <10% energy
3. Polyunsaturated fat: 6-10% energy
4. Trans fat: <1% energy
5. Total carbohydrate: 55-75% energy
6. Free sugars: <10% energy (WHO recommends <5%)
7. Protein: 10-15% energy
8. Dietary fiber: >25-30 g/day
9. Fruits and vegetables: ≥400 g/day (5 servings)
10. Salt: <5 g/day (WHO)

• Energy: based on body weight and activity
• Protein: 0.8 g/kg/day (adult)
• Fat: 20-30% energy
• Emphasis on reducing salt, sugar, and processed food intake

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Q94. GLYCEMIC INDEX (GI)

• Low GI: <55 (slow glucose rise; good for diabetics, obesity) - e.g., legumes, most fruits
• Medium GI: 55-70
• High GI: >70 (rapid glucose spike) - e.g., white rice, white bread, potatoes

• Management of type 2 diabetes
• Obesity and weight management
• Prevention of cardiovascular disease
• Useful in sports nutrition

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Q95. HISTOGRAM

• X-axis: Class intervals (continuous variable)
• Y-axis: Frequency (number or percentage)
• Bars are adjacent (touching), not separated (unlike bar chart)
• Area of each bar is proportional to frequency
• Used for continuous data (e.g., weight, height, blood pressure)

• Bar chart: Discrete/categorical data; bars separated by gaps
• Histogram: Continuous data; no gaps between bars

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Q96. FAMILY CYCLE (Phases)

1. Beginning family (married couple without children)
2. Childbearing family (birth to 30 months)
3. Families with preschool children (3-6 years)
4. Families with school children (6-13 years)
5. Families with teenagers (13-20 years)
6. Families launching young adults (first child leaves to last leaving)
7. Middle-aged parents (empty nest to retirement)
8. Aging family (retirement to death of both spouses)

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Q97. FOOD POISONING + INVESTIGATION OF FOOD POISONING

1. Bacterial (most common):
   • Staphylococcus aureus (toxin-mediated; 1-6 hrs IP; vomiting predominant)
   • Clostridium botulinum (botulism; neurotoxin; most dangerous)
   • Salmonella (infective type; 12-24 hrs IP; fever + diarrhea)
   • C. perfringens (8-22 hrs; diarrhea)
   • B. cereus (2 types: emetic 1-6hr; diarrheal 8-16hr)
   • V. parahaemolyticus (seafood; 12-24 hrs)
2. Chemical: Arsenic, lead, mercury, pesticides, zinc from galvanized containers
3. Toxic plants: Mushroom (Amanita phalloides), Datura
4. Toxic fish: Ciguatera, puffer fish (tetrodotoxin)

1. Confirm the outbreak: Collect cases, establish case definition
2. Case finding: Active case finding in community
3. Clinical investigation: Symptoms, onset, duration, common food eaten
4. Epidemiological investigation:
   • Construct epidemic curve (time-dose relationship)
   • Attack rate by food item (calculate AR for each food)
   • Identify the common vehicle (food with highest attack rate among those who ate it, and lowest among those who didn't)
5. Laboratory investigation:
   • Food samples: Culture, toxin detection
   • Patient specimens: Stool, vomit, blood cultures
   • Handler swabs
6. Control measures: Remove contaminated food, treat cases, disinfect, trace source
7. Report: Submit to authorities

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Q98. PRUDENT DIET

1. Reduce total fat intake (especially saturated and trans fats)
2. Increase consumption of complex carbohydrates and fiber
3. Reduce simple sugars
4. Reduce salt/sodium (<5g/day)
5. Increase fruits and vegetables (≥400g/day)
6. Preferred protein: Fish, legumes, low-fat dairy over red meat
7. Limit processed foods and fast foods
8. Adequate fluid intake (8 glasses water/day)
9. Limit alcohol consumption
10. Maintain energy balance to avoid obesity

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Q99. PANEL DISCUSSION

• Panelists sit facing the audience
• A moderator guides the discussion
• No formal speeches; natural conversation
• Audience participation in Q&A after

• Multiple expert perspectives
• Stimulating and interesting
• Audience learns from discussion
• Generates interest in a topic

• May become a series of speeches
• Audience may be passive
• Needs skilled moderator
• Works best for educated audience

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Q100. SLOW EPIDEMIC (Slow Virus Disease/Epidemic)

• Kuru (prion disease in Papua New Guinea - related to cannibalism)
• Creutzfeldt-Jakob disease (CJD)
• Subacute sclerosing panencephalitis (SSPE - complication of measles)
• Progressive multifocal leukoencephalopathy (PML)

• An epidemic that takes years to reach its peak
• Example: HIV/AIDS epidemic (slow rise over decades)
• Tuberculosis resurgence as a "slow epidemic"
• Used to contrast with explosive/acute epidemics from point source

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Q101. OXIDATION POND

• Aerobic zone (top): Algae produce oxygen through photosynthesis; aerobic bacteria oxidize organic matter
• Anaerobic zone (bottom): Anaerobic decomposition of settled sludge
• Facultative zone (middle): Both aerobic and anaerobic bacteria

• Low cost
• Easy maintenance
• Effective in warm sunny climates (tropical)
• Removes BOD effectively
• Kills pathogens through UV, pH, time

• Requires large land area
• Odor problems if overloaded
• Less effective in cold/cloudy climates
• Mosquito breeding if not maintained

• Treatment of sewage from small towns and communities
• Particularly suitable for rural India and developing countries

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Q102. DRUG ADDICTION, DEPENDENCE, DRUG ABUSE

• Compulsive desire to take the drug
• Tendency to increase the dose (tolerance)
• Psychological and/or physical dependence

1. Overwhelming preoccupation with obtaining and using the drug
2. Loss of control over use
3. Continued use despite harmful consequences
4. Tolerance (need more to get same effect)
5. Withdrawal symptoms on stopping

• Physical (physiological): Withdrawal symptoms (e.g., opiates, alcohol, barbiturates)
• Psychological: Craving without physical withdrawal (e.g., cocaine, cannabis)

• Opioids (heroin, opium)
• Alcohol
• Cannabis (ganja, charas, bhang)
• Tobacco
• Benzodiazepines
• Solvents/inhalants among youth

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Q103. PASTEURISATION OF MILK ★

1. Holder (Low Temperature Long Time - LTLT):
   • Heat at 63°C for 30 minutes
   • Followed by rapid cooling to <10°C
   • Older method; batch process
2. Flash (High Temperature Short Time - HTST):
   • Heat at 72°C for 15-20 seconds
   • Modern continuous flow process
   • More efficient and widely used
3. Ultra High Temperature (UHT):
   • Heat at 135-150°C for 2-4 seconds
   • Sterilizes milk; shelf life 3-6 months
   • No refrigeration needed until opened

• Bovine TB (M. bovis)
• Brucellosis
• Salmonellosis
• Q fever (Coxiella burnetii)
• Streptococcal pharyngitis

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Q104. IMPACT OF ENVIRONMENTAL SANITATION ON HEALTH + RURAL HEALTH

• Unsafe water + poor sanitation → 80% of all illnesses in developing countries
• Safe water: Prevents cholera, typhoid, hepatitis A, diarrheal diseases
• Proper waste disposal: Prevents fly-breeding, rodent proliferation
• Clean environment: Reduces malaria, filaria, dengue, JE
• Improved sanitation: Reduces soil-transmitted helminths

• Inadequate safe water supply
• Open defecation (ODF programs under Swachh Bharat Mission)
• Malnutrition
• Communicable disease burden
• Poverty and illiteracy
• Inadequate health infrastructure
• Brain drain of health workers

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Q105. MI: WEB OF CAUSATION (Myocardial Infarction)

• Age (increases with age)
• Sex (males > pre-menopausal females)
• Genetic predisposition / family history
• Racial/ethnic factors

• Hypertension (systolic BP > 140 mmHg)
• Hyperlipidemia (especially raised LDL, low HDL)
• Diabetes mellitus
• Smoking / tobacco use

• Physical inactivity / sedentary lifestyle
• Obesity (especially central/abdominal)
• Unhealthy diet (high saturated fat, low fiber)
• Psychosocial stress, Type A personality

• Socioeconomic status
• Occupation stress
• Urban lifestyle

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Q106. HEALTH INFORMATION SYSTEM - DEFINE, USES, SOURCES

1. Census (10-yearly) - population, literacy, household data
2. Vital statistics (birth/death registration system - Civil Registration System, CRS)
3. Notification of diseases (under Epidemic Diseases Act)
4. Hospital records and discharge data
5. Health surveys (NFHS - National Family Health Survey, DLHS)
6. Epidemiological surveillance
7. Sample Registration System (SRS) - birth/death rates by sampling
8. Disease registries (cancer, TB, HIV)
9. Insurance/HMIS data

1. Monitor health status of population
2. Detect disease outbreaks and epidemics
3. Plan and evaluate health programs
4. Allocate resources
5. Research and training
6. International reporting (WHO)

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Q107. SEWAGE, SULLAGE + MODERN SEWAGE TREATMENT PLANT

• Sewage: Liquid waste from residential, commercial, and industrial sources carried in sewers. Contains human excreta, household wastewater, industrial effluents.
• Sullage (Grey water): Wastewater from sinks, baths, laundry - does NOT include toilet waste. Less contaminated than sewage.
• Night soil: Human excreta collected from dry latrines/buckets (no water flush).

• 99.9% water; 0.1% solids
• Organic matter, pathogens, nutrients (N, P), heavy metals

• BOD (Biochemical Oxygen Demand): Oxygen required by bacteria to oxidize organic matter in 5 days at 20°C. Standard: BOD₅. Higher BOD = more polluted.
• COD (Chemical Oxygen Demand): Total oxygen demand
• Suspended solids, pH, coliform count

1. Preliminary treatment: Screening (removes large solids), grit removal
2. Primary treatment (Sedimentation): Allows settling of suspended solids; produces primary sludge; removes ~40% BOD
3. Secondary (Biological) treatment:
   • Trickling filter (Percolating filter): Sewage trickled over bed of stones; biofilm degrades organic matter
   • Activated sludge process: Aeration tank with return sludge; aerobic bacteria digest organic matter; removes ~85-95% BOD
4. Tertiary treatment (Advanced): Removes nutrients (N, P), microorganisms; chlorination for disinfection

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Q108. CENSUS

• Conducted every 10 years (decennial)
• Legal basis: Census Act of 1948
• Directed by: Census Commissioner of India (under Registrar General of India)
• First modern census: 1881 (Lord Ripon)
• Last census: 2011 (2021 delayed due to COVID-19)

• Universality (covers all)
• Simultaneity (same reference date/night)
• Individual enumeration

• Population size, age, sex distribution
• Literacy, education, occupation
• Housing, religion, language, disability
• SC/ST populations

• Planning health services
• Calculating vital rates
• Resource allocation
• Legislative delimitation

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Q109. POPULATION EXPLOSION

• Stage 1: High BR, high DR - stable (pre-industrial)
• Stage 2: High BR, falling DR - population EXPLOSION (developing countries like India)
• Stage 3: Falling BR, low DR - slow growth
• Stage 4: Low BR, low DR - stable/declining (developed countries)

• 1947: ~340 million; 2011: 1.21 billion; 2024: ~1.44 billion
• Annual growth rate peaked at 2.25% (1971-81); now ~1%

• Food insecurity
• Unemployment
• Strain on health/education services
• Environmental degradation
• Urban overcrowding

• Launched 1952 (India was first country with official family planning program)
• Changed to Family Welfare Programme
• Methods: Tubectomy, Vasectomy, IUCD, OCP, condom, emergency contraception
• Two-child norm (incentivized)
• Delayed marriage (legal minimum: 18 women, 21 men)

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Q110. CARE (Community-level Strategies)

• C - Child feeding (breastfeeding, complementary feeding)
• A - Access to health care
• R - Responsive feeding and caregiving
• E - Environmental health and hygiene

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Q111. DEMOGRAPHIC CYCLE (Demographic Transition)

1. Pre-industrial/High stationary: High BR + High DR → stable population (e.g., primitive societies)
2. Early expanding (High expanding): High BR + Falling DR → rapid population growth. Death rates fall due to medical advances, improved sanitation. (Most developing countries passed through this)
3. Late expanding: Falling BR + Low DR → slowing growth. As economic development occurs, people choose fewer children.
4. Low stationary: Low BR + Low DR → stable/declining population. (Developed countries - Europe, Japan)

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Q112. ESSENTIAL OBSTETRIC CARE

• Parenteral antibiotics
• Parenteral oxytocics
• Parenteral anticonvulsants (for eclampsia)
• Manual removal of placenta
• Assisted delivery (vacuum/forceps)
• MVA for incomplete abortion

• All BEmOC services PLUS
• Cesarean section
• Blood transfusion

1. Delay in decision to seek care (home level)
2. Delay in reaching a facility (transport)
3. Delay in receiving adequate care (facility level)

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Q113. LEVELS OF HEALTH CARE

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Q114. ARTHROPOD CONTROL - PRINCIPLES

1. Environmental management (best, most sustainable):
   • Elimination of breeding sites
   • Proper drainage, filling water bodies
   • Source reduction
2. Chemical control:
   • Insecticides: Organochlorines (DDT), organophosphates (malathion), pyrethroids
   • Larvicides: Temephos (abate) for water
3. Biological control:
   • Larvivorous fish (Gambusia)
   • Bacillus thuringiensis israelensis (Bti)
   • Natural predators
4. Genetic control:
   • Sterile male release technique
   • Wolbachia-infected mosquitoes
5. Personal protection:
   • Insecticide-treated bed nets (ITNs/LLINs)
   • Repellents (DEET)
   • Protective clothing
6. Community participation
7. Integrated Vector Management (IVM): Combination of multiple methods

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Q115. (BIOLOGICAL) EFFECTS OF RADIATION

• Acute (large dose, short time):
  • Radiation sickness syndrome: Nausea, vomiting, bone marrow suppression
  • Acute radiation syndrome (ARS) at >1 Gy
  • Radiation burns
  • Death (LD50 = ~3-4 Gy whole body for humans)
• Late/Chronic (small doses, long time):
  • Malignancies: Leukemia (most common radiation-induced cancer), lung, thyroid, breast, bone cancers
  • Cataracts
  • Life shortening
  • Aplastic anemia

• Gene mutations (point mutations)
• Chromosomal aberrations
• May manifest in subsequent generations

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Q116. SOURCES OF HEALTH INFORMATION

1. Census (decennial)
2. Vital statistics / Civil Registration System (CRS)
3. Sample Registration System (SRS) - birth/death rates
4. Notification system (notifiable diseases)
5. Hospital records and discharge data (HMIS)
6. Health surveys (NFHS, DLHS, AHS)
7. Disease surveillance systems (IDSP - Integrated Disease Surveillance Programme)
8. Special surveys (nutritional surveys, KAP surveys)
9. Disease registries (NCRP for cancer)
10. Health management information system (HMIS/DHIS2)

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Q117. SURVEILLANCE - TYPES

1. Passive surveillance: Health facilities report cases through routine channels; low effort; often underreports
2. Active surveillance: Health authorities actively search for cases; more complete; expensive
3. Sentinel surveillance: Data collected from selected "sentinel sites" (representative institutions); used for HIV, influenza
4. Syndromic surveillance: Monitors clinical syndromes (fever, diarrhea) before confirmed diagnosis; good for early warning
5. Laboratory-based surveillance: Based on lab confirmation
6. Mortality surveillance: Death certificate analysis
7. Serological (serosurvey): Measures antibody prevalence in population

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Q118. PERT (Programme Evaluation and Review Technique)

• Helps in detailed planning and supervision
• Identifies the Critical Path (longest path through the network = minimum time for project completion)
• Uses three time estimates: Optimistic (O), Most likely (M), Pessimistic (P)
• Expected time = (O + 4M + P) / 6

1. Identify all activities
2. Determine sequence/dependencies
3. Construct network diagram
4. Calculate earliest and latest times
5. Identify critical path
6. Monitor progress

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Q119. SPECTRUM OF IODINE DEFICIENCY DISORDERS (IDD)

• Spontaneous abortions, stillbirths
• Congenital anomalies
• Cretinism: Neurological (mental retardation, deaf-mutism, spastic diplegia) and myxedematous types
• Increased perinatal mortality

• Neonatal goitre
• Neonatal hypothyroidism
• Increased neonatal mortality
• Subclinical cretinism: Retarded brain development

• Goitre
• Juvenile hypothyroidism
• Impaired mental function, retarded physical development
• Increased susceptibility to nuclear radiation (thyroid uptake of radioactive iodine)

• Goitre (endemic)
• Hypothyroidism
• Impaired mental function
• Iodine-induced hyperthyroidism (Jodbasedow)

• Universal iodization of salt (>15 ppm at consumer level)
• 4 components: Iodized salt supply, monitoring/surveillance, manpower training, mass communication

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Q120. MALNUTRITION - PREVENTIVE AND SOCIAL MEASURES + ECOLOGICAL FACTORS

1. Dietary inadequacy (insufficient food, poor diet quality)
2. Poverty (cannot afford nutritious food)
3. Infection (increases nutrient needs, reduces absorption)
4. Ignorance and faulty feeding practices
5. Taboos and food beliefs
6. Large family size
7. Low birth weight / prematurity
8. Poor agricultural production
9. Inequitable food distribution

1. Dietary diversification: Balanced diet with diverse food groups
2. Food fortification: Iodine, iron, Vitamin A
3. Supplementation: High-dose Vitamin A (every 6 months 6mo-5yr), IFA, zinc
4. Breastfeeding promotion: Exclusive breastfeeding for 6 months
5. Complementary feeding: Appropriate timely introduction
6. Treatment of infections: ORS, deworming (albendazole 6-monthly)
7. ICDS programme: Supplementary nutrition
8. PDS (Public Distribution System): Food security
9. MGNREGS: Income support → food purchasing power

• Poverty alleviation
• Women's education and empowerment
• Girl child education
• Delayed marriage
• Family planning (birth spacing)
• Safe water and sanitation

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Q121. PREVENTIVE AND SOCIAL MEASURES TO REDUCE CHROMOSOMAL ABNORMALITIES

1. Genetic counseling: For couples with family history, advanced maternal age, previous affected child; discuss recurrence risk
2. Prenatal diagnosis: Amniocentesis, CVS, fetal ultrasound (see Q74)
3. Carrier detection: Karyotyping, molecular diagnosis for balanced translocation carriers
4. Avoid advanced maternal age: Promote childbearing before age 35 (risk of Down syndrome increases sharply after 35)
5. Avoid teratogens during pregnancy:
   • Radiation exposure
   • Chemicals (pesticides, alcohol - fetal alcohol syndrome)
   • Drugs (valproate, thalidomide)
   • Infections (TORCH - rubella, CMV)
6. Periconceptional folic acid: 0.4 mg/day reduces NTDs (not chromosomal but neural tube); 5 mg for high-risk
7. Registration of congenital anomalies: Surveillance and data for planning

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Q122. MODES OF TRANSMISSION OF DISEASE

1. Direct contact: Touching, kissing, sexual intercourse (STIs, scabies, herpes)
2. Droplet infection: Large respiratory droplets (<1 m distance) - measles, mumps, rubella, pertussis
3. Contact with soil: Tetanus, hookworm, anthrax (spores in soil)
4. Inoculation into skin/mucosa: Rabies (bite), hepatitis B (needlestick)
5. Transplacental (vertical): HIV, rubella, syphilis, CMV, toxoplasma

1. Vehicle-borne:
   • Water: Cholera, typhoid, hepatitis A
   • Food: Salmonella, staphylococcal food poisoning
   • Fomites: Clothing, instruments (smallpox, scabies)
   • Blood/blood products: HIV, hepatitis B/C
   • Biological products: Vaccines (if contaminated)
2. Vector-borne:
   • Mechanical: Fly carrying pathogens on body
   • Biological: Parasite develops in vector (malaria in Anopheles, plague in flea)
3. Airborne:
   • Droplet nuclei (<5 μm; remain suspended in air; travel long distances): TB, measles, chickenpox, COVID-19
   • Dust particles: Histoplasmosis, Q fever

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Q123. PRINCIPLES/METHODS OF HEALTH COMMUNICATION, FUNCTION

1. Credibility: Source must be trustworthy
2. Context: Message must be appropriate to local setting
3. Content: Must be meaningful and relevant
4. Clarity: Simple, understandable language
5. Continuity and Consistency: Repeated messages
6. Channel: Right medium for the audience
7. Capability of audience: Literacy, culture

1. Individual/Interpersonal: Home visits, counseling, bedside teaching
2. Group methods: Lectures, demonstrations, group discussions, role play, drama, puppet shows, symposia, panel discussions, workshops
3. Mass media: Radio, TV, newspapers, billboards, social media, pamphlets, posters

• Information sharing
• Motivation for behavior change
• Creating awareness
• Building skills (how-to demonstrations)
• Advocacy
• Norm change at community level

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Q124. CONSUMER PROTECTION ACT + RIGHTS OF PATIENTS

1. Right to information: Full disclosure of diagnosis, treatment options, risks
2. Right to choose: Informed consent before any procedure
3. Right to confidentiality: Medical information not disclosed without consent
4. Right to seek second opinion
5. Right to emergency treatment: Cannot be refused even without payment
6. Right to get medical records (copies of treatment records)
7. Right to redress: Compensation for negligence/deficiency in service

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Q125. SOCIAL GOALS OF HOUSING

1. Adequate living space - prevents overcrowding and its consequences (TB, respiratory infections)
2. Privacy - essential for physical, mental, and social wellbeing
3. Permanent structure - protection from environmental hazards
4. Natural light and ventilation - prevents rickets, respiratory disease
5. Safe water supply within or near premises
6. Safe sanitation - toilet, drainage
7. Facilities for cooking, food storage
8. Freedom from damp, cold, pollution
9. Protection from accidents
10. Community facilities - roads, schools, play areas

• Overcrowding → TB, respiratory infections, meningitis
• Damp → rheumatism
• Poor ventilation → CO poisoning, respiratory disease
• Poor water/sanitation → diarrheal diseases
• Indoor air pollution (cooking fuels) → COPD, lung cancer

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Q126. STATISTICAL DATA PRESENTATION ★

• Simple table, frequency distribution table
• Cross-tabulation (two-way table)

1. Bar chart: Discrete/categorical data; separated bars; vertical or horizontal
2. Pie chart: Parts of a whole; percentages; max 6-7 segments for clarity
3. Histogram: Continuous data; adjacent bars; area proportional to frequency
4. Frequency polygon: Continuous data; midpoints of histogram bars connected by lines
5. Line diagram (line graph): Trends over time; most useful for time-series data
6. Scatter diagram: Relationship between two continuous variables; shows correlation
7. Pictogram: Uses pictures/symbols to represent data; for general public
8. Map/Spot map: Geographical distribution of disease
9. Box plot: Distribution, median, quartiles, outliers

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Q127. BIAS IN EPIDEMIOLOGICAL RESEARCH

• Berkson bias (hospital admission bias) - in case-control studies using hospital patients
• Volunteer bias (healthy worker effect)
• Loss to follow-up bias in cohort studies

• Recall bias: Cases remember past exposures better than controls (affects case-control studies)
• Observer bias: Investigator knows subject's status, influences measurement
• Interviewer bias: Leading questions

• Randomization (RCT) - controls confounding
• Blinding (single, double, triple) - controls observer and recall bias
• Random sampling
• Standardized questionnaires
• Matching in case-control studies

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Q128. LOGISTICS AND STEPS FOR EDUCATION OF A GROUP OF VILLAGERS DRINKING ALCOHOL

1. Community assessment: Survey to know extent of alcohol use, reasons (social norms, occupation-related, celebration), and health consequences in this community
2. Set objectives: Reduce alcohol consumption; raise awareness of harms; promote seeking help
3. Choose appropriate method: Group approach best for rural community - group discussion, drama/street play, film screening
4. Logistics:
   • Venue: Village panchayat hall, school, community centre
   • Time: Evening or after harvest (when villagers are free)
   • Facilitator: ANM, ASHA, Medical Officer, NGO worker
   • Materials: Flip charts, posters (pictorial for low literacy), audiovisual aids
5. Content of education:
   • Health harms: Liver cirrhosis, neurological damage, accidents
   • Family and economic consequences
   • Link with violence and domestic abuse
   • Available treatment (De-addiction centres under NMHP)
   • National programme: National Alcohol Policy
6. Community involvement: Involve panchayat leaders, ASHA workers, self-help groups, women's groups
7. Evaluation: Pre- and post-KAP (Knowledge, Attitude, Practice) assessment

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Q129. NEWBORN SCREENING TESTS

1. Congenital hypothyroidism (CH): TSH from heel prick blood spot; treated with levothyroxine → prevents cretinism
2. Phenylketonuria (PKU): Elevated phenylalanine; treated with phenylalanine-restricted diet → prevents mental retardation
3. Congenital adrenal hyperplasia (CAH): 17-OH progesterone; treated with steroids
4. G6PD deficiency: Enzyme assay; avoid oxidant drugs
5. Galactosemia: Galactose enzyme assay; treated with galactose-free diet
6. Sickle cell disease: Hemoglobin electrophoresis
7. Hearing screening (UNHS - Universal Newborn Hearing Screening): DPOAE test

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Q130. GROWTH CHARTS - USES

1. Monitor growth: Track individual child's growth pattern over time
2. Detect malnutrition early: Identify faltering growth (Growth Monitoring and Promotion - GMP)
3. Grade malnutrition: WAZ, HAZ, WHZ scores; IAP grading (Grade I-IV)
4. Identify at-risk children for supplementary nutrition programs
5. Evaluate effectiveness of nutrition programs
6. Health education tool: Show mothers their child's progress; motivate improved feeding
7. Screening tool at community level (ICDS Anganwadi)

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Q131. CONCEPT OF WELL-BEING

1. Physical well-being: Good nutrition, physical fitness, absence of disease
2. Mental well-being: Positive emotions, resilience, sense of purpose, self-esteem
3. Social well-being: Strong relationships, social support networks, social functioning
4. Spiritual well-being (some frameworks): Sense of meaning and purpose
5. Occupational well-being: Job satisfaction, work-life balance
6. Environmental well-being: Safe, clean, supportive environment

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Q132. DALY (Disability-Adjusted Life Year) ★

• Developed by WHO/World Bank for Global Burden of Disease (GBD) study
• Combines mortality and morbidity into a single measure
• Allows comparison of burden across diseases and countries
• Used for: priority setting in health policy, cost-effectiveness analysis, resource allocation

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Q133. MIGRATION STUDIES - IMPORTANCE

• Disease rates in the country of origin
• Disease rates in the host country

1. Separates genetic from environmental factors: If migrants' disease rates approach those of the host country → environment/lifestyle dominant (not genes)
2. Identify etiological factors: Dietary patterns, occupational exposures, social factors
3. Example - Coronary Heart Disease: Japanese in Japan have low CHD; Japanese who migrated to USA have higher CHD rates approaching US rates → diet and lifestyle important
4. Cancer studies: Breast cancer rates in Japanese-Americans approach American rates → environmental/dietary factors
5. Help understand acculturation effects on health

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Q134. PASSIVE IMMUNITY

• Transfer of maternal antibodies via placenta (IgG) → protects newborn for 3-6 months
• Transfer via breast milk (IgA - secretory IgA in colostrum) → mucosal protection

• Homologous (human) immunoglobulin: Normal human immunoglobulin (NHIG), Specific immunoglobulin (e.g., HBIG for hepatitis B, RIG for rabies, VZIG for varicella, TIG for tetanus)
• Heterologous (animal - equine) antiserum: Diphtheria antitoxin, antivenom (snake), tetanus antitoxin (ATS)

• Immediate onset of protection
• Short duration: 3-6 weeks (animal sera) to 3-6 months (human IgG)
• Risk of serum sickness with animal sera (heterologous)
• No immunological memory

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Q135. ROLE OF MILLETS IN UNDERNUTRITION

• Ragi (finger millet): Richest calcium content among cereals (~344 mg/100g); good iron (3.9 mg/100g); high fibre
• Bajra (pearl millet): High iron (8 mg/100g); good protein quality
• Jowar (sorghum): High carbohydrate; gluten-free
• All millets: Higher fibre than rice/wheat; low glycemic index; resistant starch

1. Iron deficiency anemia: Bajra is high in iron; ragi in iron
2. Calcium deficiency/bone health: Ragi - excellent calcium source; prevents osteoporosis and rickets
3. Protein quality: Some millets have better amino acid profiles than rice
4. Energy dense: Suitable for children with high energy needs
5. Micronutrient rich: Zinc, B vitamins (niacin, thiamine)
6. Affordable: Cheaper than rice/wheat; accessible to poor
7. Climate resilient: Grow in drought-prone areas; food security in dryland farming regions

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Q136. HIDDEN HUNGER

• Iron → anemia; impairs cognitive development, work capacity
• Iodine → IDD, cretinism, hypothyroidism
• Vitamin A → night blindness, xerophthalmia, increased infection susceptibility
• Zinc → impaired growth, immune function, wound healing
• Folate → NTDs in fetus
• Vitamin B12, Calcium, Vitamin D

• Mental impairment
• Poor health and immune function
• Low productivity
• Increased maternal and child mortality
• Poor school performance

• Dietary diversification
• Food fortification (double-fortified salt, fortified flour)
• Supplementation programs
• Biofortification of staple crops

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Q137. CONTROL OF SCABIES SPREAD

1. Case treatment:
   • Permethrin 5% cream: Drug of choice; apply from neck down; leave 8-14 hrs; repeat after 1 week
   • Benzyl benzoate (25% adult, 12.5% child, 6.25% infant): Apply twice in 24 hours; repeat after 1 week
   • Ivermectin (oral): 200 μg/kg; especially for crusted (Norwegian) scabies and mass treatment
   • Malathion 0.5%: Alternative
2. Treat all contacts simultaneously: All household members and close contacts treated at the same time even if asymptomatic (to prevent re-infection)
3. Laundry: All clothing, bedding, towels washed in hot water and dried in sun/dryer; items that cannot be washed should be sealed in plastic bag for 72 hours
4. Environmental hygiene: Clean living spaces
5. Avoid close contact until treatment complete
6. School/institution outbreaks: Mass treatment of all residents/students
7. Follow-up: Re-treat after 1 week; itching may persist 2-4 weeks after successful treatment (hypersensitivity reaction)

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Q138. ATTACK RATE (AR) - FORMULA AND IMPORTANCE

AR = (Number of new cases in a group / Total number at risk in that group) × 100

SAR = (Number of new cases among contacts / Total susceptible contacts) × 100

AR = (New cases / Total population exposed) × 100

1. Used primarily in acute epidemic investigation (food poisoning outbreaks, foodborne disease)
2. Calculate food-specific attack rate to identify the implicated vehicle (food): The food with the highest AR among those who ate it AND the lowest AR among those who didn't = implicated food
3. SAR measures the communicability of a disease within households; reflects secondary transmission
4. Differs from incidence rate: AR is used for a specific exposure/epidemic period; incidence rate is continuous
5. Useful in estimating risk of infection in a defined exposed population

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Q139. LEVELS OF COMMUNICATION BETWEEN DOCTOR AND PATIENT

1. Intrapersonal communication: Internal thinking/self-talk of the doctor (reflection, clinical reasoning)
2. Interpersonal communication: One-on-one between doctor and patient (the most important in clinical care):
   • Verbal: Words, language, tone, clarity of explanation
   • Non-verbal: Eye contact, body language, facial expressions, touch, posture, proximity
   • Listening: Active listening is critical
3. Transactional model: Communication as a two-way exchange where both doctor and patient send AND receive messages simultaneously

• Use simple, jargon-free language
• Check patient understanding (teach-back method)
• Empathy and respect
• Encourage questions
• Maintain confidentiality
• Informed consent - adequate explanation

• Language/dialect differences
• Low health literacy of patient
• Doctor's time pressure
• Cultural differences
• Emotional distress of patient

• Paternalistic model: Doctor decides, patient complies
• Informative model: Doctor provides information, patient decides
• Interpretive model: Doctor helps patient clarify values and make decisions
• Deliberative model: Best - shared decision making; doctor and patient discuss options together

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Q140. GREAT SANITARY AWAKENING

• Edwin Chadwick (1842): "Report on the Sanitary Condition of the Labouring Population of Great Britain" - linked poverty and poor sanitation to disease; advocated for clean water, sewers, drainage
• John Snow (1854): "Father of Epidemiology" - mapped cholera cases in London (Broad Street pump outbreak); proved waterborne transmission without germ theory
• Lemuel Shattuck (1850): "Report of the Sanitary Commission of Massachusetts" - laid foundation of modern public health
• William Farr: First medical statistician; analyzed vital statistics

• Public Health Act (UK) 1848 - first such Act
• Establishment of Boards of Health
• Construction of sewage systems (Bazalgette's London sewer system)
• Clean water supplies
• Foundations of modern public health practice

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Q141. EPIDEMIC CURVE

1. Point source epidemic:
   • Steep rise and rapid fall
   • Single sharp peak
   • Cases clustered within one incubation period
   • Example: Food poisoning outbreak
2. Propagated (person-to-person) epidemic:
   • Gradual rise with a series of waves/peaks
   • Each successive wave = one incubation period apart
   • Cases spread over multiple incubation periods
   • Example: Measles, chickenpox outbreak
3. Continuous source epidemic:
   • Plateau (prolonged exposure at constant level)
   • Extended duration

• Identify type of epidemic (point source vs propagated)
• Estimate probable time of exposure (for point source: trace back one incubation period from peak)
• Estimate whether epidemic is ongoing or declining
• Guide control measures

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Q142. SEPTIC TANK

1. Septic tank (settling chamber): Anaerobic digestion; sludge settles at bottom; scum floats on top; clarified effluent in middle exits
2. Soil absorption system (soak pit/leach field): Effluent absorbed into soil; aerobic digestion in soil; soil acts as filter

• Suitable for areas without sewers
• Self-contained; minimal maintenance
• Treats waste on-site; no transport needed
• Low operating cost

• Not suitable for clay soils (poor absorption)
• Risk of groundwater contamination if poorly constructed
• Periodic desludging required
• Not effective for large communities
• Effluent still contains pathogens

• Soak pit (simpler; for greywater)
• Aqua privy
• Biogas digesters (energy recovery)

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