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National Programs in Prenatal Care (PNC) - India

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I. Antenatal Care (ANC) - Essential Components under National Guidelines

1. Early registration of all pregnancies within the first trimester (before 12 weeks)
2. Minimum 4 ANC visits (WHO now recommends 8):
   • 1st visit: within 12 weeks (registration + first check-up)
   • 2nd visit: 14-26 weeks
   • 3rd visit: 28-34 weeks
   • 4th visit: 36 weeks to term
3. Associated services: height, weight, BP, anaemia check, abdominal examination, breast examination, folic acid (1st trimester), IFA supplementation from 12 weeks, tetanus toxoid injection, anaemia treatment
4. Minimum investigations: urine for pregnancy confirmation, Hb estimation, urine for albumin and sugar
5. Name-based tracking of all pregnant women for assured service delivery
6. Identification of high-risk pregnancies and danger signs
7. Malaria prophylaxis in endemic zones (as per NVBDCP guidelines)
8. Counselling: diet, rest, tobacco cessation, institutional delivery, birth preparedness, complication readiness
9. Information on JSY and other government scheme entitlements
10. RTI/STI identification and referral; HIV/AIDS counselling

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II. Key National Programs in PNC (India)

1. Janani Suraksha Yojana (JSY) - 2005

• Launched: 12th April, 2005 (modification of the earlier National Maternity Benefit Scheme)
• Objective: Reduce maternal and neonatal mortality by promoting institutional deliveries, especially in Below Poverty Line (BPL) families
• 100% centrally sponsored scheme under NRHM
• Provides cash assistance integrated with institutional ANC, delivery, and immediate postpartum care
• Two categories of states:
  • Low Performing States (LPS): UP, Uttarakhand, MP, Jharkhand, Bihar, Rajasthan, Chhattisgarh, Odisha, Assam, J&K - all women regardless of BPL status
  • High Performing States (HPS): Only BPL women + SC/ST women
• Cash assistance scale (from 2012-13):

• ASHA acts as a link health worker responsible for making available institutional ANC, postnatal care, and escorting pregnant women to health centres

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2. Janani Shishu Suraksha Karyakram (JSSK) - 2011

• Launched: 1st June, 2011
• Objective: Eliminate out-of-pocket expenses for pregnant women delivering in public health institutions
• Entitlements:
  • Absolutely free delivery (including caesarean section)
  • Free drugs and consumables
  • Free diet: up to 3 days for normal delivery, up to 7 days for C-section
  • Free diagnostics and free blood
  • Free transport: home to institution, between facilities (referral), and drop-back home
  • Extended to sick newborns in public facilities up to 30 days after birth
  • Scheme extended to cover complications during ANC, PNC and sick infants
• Estimated to benefit over 12 million pregnant women per year

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3. Pradhan Mantri Surakshit Matritva Abhiyan (PMSMA) - 2016

• Launched: June 2016 by the Ministry of Health & Family Welfare
• Objective: Provide fixed-day, free-of-cost, assured, quality ANC to all pregnant women
• Minimum ANC package (investigations + drugs) provided on the 9th of every month at designated government health facilities
• Involves private sector volunteers providing specialist care at government facilities
• Achievements: ~2.20 crore ANC check-ups by ~6,000 volunteers at >17,000 government facilities; >11.66 lakh high-risk pregnancy cases identified nationally

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4. SUMAN (Surakshit Matritva Aashwasan) - 2019

• Launched: 10th October, 2019
• Objective: Assured, dignified, respectful, and quality healthcare at no cost with zero tolerance for denial of services for every woman and newborn at public health facilities
• Expected outcome: "Zero preventable maternal and newborn deaths and high quality of maternity care delivered with dignity and respect"

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5. LaQshya Programme - 2017

• Launched by MOHFW in 2017
• Objective: Improve quality of care in labour rooms and maternity OTs in public health facilities
• Evidence-based approach to improve maternal and newborn care and provide respectful care during the intrapartum and postpartum periods
• Implementation: infrastructure upgradation, essential equipment availability, adequate staffing

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III. Postnatal Care (PNC) Components under National Guidelines

1. Early breastfeeding initiation within 1 hour of birth
2. Postnatal home visits on days 0, 3, 7, and 42 for home/sub-centre deliveries
3. Ensure visits on days 3 and 7 for institutional deliveries
4. Management of postpartum complications

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Summary Table

• Park's Textbook of Preventive and Social Medicine, pp. 514-517 and pp. 4785-4815

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Role and Responsibilities of ASHAs in India's Prenatal Programs

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Who is an ASHA?

• Must be a resident of the same village she serves
• A woman (married/widow/divorced), preferably aged 25-45 years
• Minimum 8th standard education, with communication skills and leadership qualities
• Adequate representation from disadvantaged population groups
• General norm: 1 ASHA per 1,000 population; in tribal, hilly, and desert areas, the norm is relaxed to 1 ASHA per habitation

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Core Roles and Responsibilities

1. Health Awareness and Education

• Nutrition, basic sanitation, and hygienic practices
• Healthy living and working conditions
• Existing health services and the need for timely utilization of health and family welfare services

2. Counselling in Prenatal and Maternal Health

• Birth preparedness and importance of safe delivery
• Breastfeeding and complementary feeding
• Immunization and contraception
• Prevention of reproductive tract infections (RTI) and sexually transmitted infections (STI)
• Care of the young child

3. Community Mobilization for ANC and PNC

• Antenatal check-ups at sub-centres and PHCs
• Postnatal check-ups
• Supplementary nutrition programs
• Immunization services at anganwadi centres and outreach sessions

4. Escorting Pregnant Women to Facilities

5. Village Health Planning

6. Primary Medical Care and Drug Depot

• Provides primary care for minor ailments (diarrhoea, fevers), first-aid for minor injuries
• Acts as a DOTS provider under the Revised National Tuberculosis Control Programme (RNTCP)
• Serves as a depot holder for essential supplies: ORS, IFA tablets, chloroquine, disposable delivery kits, oral pills, and condoms
• A drug kit (containing AYUSH and allopathic formulations) is provided to every ASHA

7. Disease Surveillance

• Reports births and deaths in her village to the sub-centre/PHC
• Reports unusual health problems and disease outbreaks in the community

8. Sanitation Promotion

• Promotes construction of household toilets under the Total Sanitation Campaign

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ASHA's Role in Specific Prenatal Programs

Under Janani Suraksha Yojana (JSY)

• Making available institutional ANC and postnatal care
• Escorting pregnant women to health centres for delivery
• Facilitating cash assistance to beneficiaries

Under Home Based Newborn Care (HBNC)

• Institutional delivery: 6 visits (Day 3, 7, 14, 21, 28, 42)
• Home delivery: 7 visits (Day 1, 3, 7, 14, 21, 28, 42)
• C-section delivery: Full 5 visits from Day 7 to Day 42

• Recording of birth weight in the Mother and Child Protection Card
• Immunization with BCG, first OPV, Hep-B, and DPT/pentavalent vaccine
• Birth registration
• Both mother and newborn being safe until the 42nd day

• Twin deliveries: Rs. 500; triplets: Rs. 750
• Low birth weight babies followed up for 2 years (Rs. 50/month incentive)
• SNCU-discharged babies followed up for 1 year

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Integration with the Health System (the "Triad")

ASHA - Anganwadi Worker (AWW) Integration

• AWW organizes Health Days (once/twice a month) at the anganwadi centre, where ASHA mobilizes women, adolescent girls, and children for orientation on: nutritious food, care during pregnancy, importance of ANC, and institutional delivery
• AWW acts as depot holder for ASHA's drug kits
• ASHA supports AWW in mobilizing pregnant and lactating women for nutrition supplements
• ASHA brings beneficiaries to anganwadi centres on immunization and health check-up days

ASHA - ANM Integration

• ANM holds weekly/fortnightly meetings with ASHA to review activities
• ANM informs ASHA of outreach session dates and guides beneficiary mobilization
• ANM guides ASHA on motivating pregnant women for: full IFA course, tetanus toxoid injections, ANC visits
• ANM educates ASHA on danger signs of pregnancy and labour so she can identify and refer cases timely
• ANM guides ASHA in motivating couples to adopt family planning

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Summary: ASHA's Prenatal Role at a Glance

• Park's Textbook of Preventive and Social Medicine, pp. 514-521, 997-998

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Epidemiological Methods & Study Designs

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Classification of Epidemiological Studies

EPIDEMIOLOGICAL STUDIES
│
├── OBSERVATIONAL
│   ├── DESCRIPTIVE
│   │   ├── Cross-sectional (Prevalence) studies
│   │   ├── Longitudinal studies
│   │   ├── Case reports / Case series
│   │   └── Ecological (Correlational) studies
│   │
│   └── ANALYTICAL
│       ├── Case-Control (Retrospective) study
│       └── Cohort (Prospective / Longitudinal) study
│
└── EXPERIMENTAL
    ├── Randomized Controlled Trial (RCT)
    ├── Field trial
    └── Community trial

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1. Descriptive Epidemiology

Key variables studied:

• Person: Age, sex, ethnicity, marital status, occupation, social class, behaviour, stress, migration
• Place: Country, urban vs. rural, endemic zones, geographical clustering
• Time: Secular (long-term) trends, seasonal variation, epidemic patterns

Cross-Sectional Studies (Prevalence Studies)

• Based on a single examination of a cross-section of population at one point in time
• Also called a "photograph" of the population
• Provides prevalence data (not incidence)
• More useful for chronic than short-lived (acute) diseases
• Example: studying the distribution of hypertension in a population along with age, sex, body weight, salt intake simultaneously
• Limitation: Cannot establish time sequence (i.e., cannot prove causation); provides little information about natural history or incidence

Longitudinal Studies

• Observations are repeated in the same population over a prolonged period via follow-up examinations
• Compared to a "cine film" (vs. cross-sectional = photograph)
• Useful for:
  1. Studying natural history and future outcome of disease
  2. Identifying risk factors
  3. Finding incidence rate (new cases over time)
• More time-consuming and difficult to organize than cross-sectional studies

Ecological (Correlational) Studies

• Compare disease rates and exposure levels across populations or groups, not individuals
• Useful for generating hypotheses but subject to the ecological fallacy (group-level association may not apply to individuals)

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2. Analytical Epidemiology

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A. Case-Control Study (Retrospective Study)

1. Both exposure and disease have occurred before the study starts
2. Proceeds from effect → cause (retrospective)
3. Uses a control/comparison group

The 2×2 Table (Framework)

• Odds Ratio (OR) = ad/bc (measure of association)
• OR > 1 = exposure associated with increased disease risk

Four Basic Steps:

1. Selection of cases and controls
2. Matching (to control confounding)
3. Measurement of exposure
4. Analysis and interpretation

Selection of Cases:

• Diagnostic criteria must be pre-defined (e.g., histologically confirmed cancer)
• Eligibility criteria: Prefer newly diagnosed (incident) cases over old/prevalent cases
• Sources: Hospitals (convenient) or General population (population-based, less bias)

Selection of Controls:

• Must be free from the disease under study
• Should be comparable to cases in all relevant variables except the exposure
• Sources: Hospital controls, neighbourhood controls, relatives, etc.

Matching (Controlling Confounding):

• A confounding factor is one that is associated both with exposure and with disease, and is unequally distributed between cases and controls
• Classic example: In studying alcohol and oesophageal cancer, smoking is a confounding factor (associated with both alcohol use and oesophageal cancer)
• Types of matching:
  • Group/frequency matching: Distribute matched variables equally across strata
  • Pair matching: Each case is matched with one control on specific variables (e.g., age, sex, occupation)
• Caution: Do NOT match on the suspected aetiological factor itself - this eliminates the ability to study that factor

Advantages of Case-Control Studies:

• Relatively quick and inexpensive
• Suitable for rare diseases
• Can study multiple exposures simultaneously
• No risk to subjects
• No follow-up required

Disadvantages:

• Recall bias (cases recall past exposure differently than controls)
• Selection bias in choosing controls
• Cannot calculate incidence or relative risk directly (only OR)
• Difficult to validate exposure information
• Not suitable for rare exposures

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B. Cohort Study (Prospective / Longitudinal Study)

1. Cohorts identified before disease appears
2. Study groups observed over time for disease frequency
3. Proceeds from cause → effect (prospective)

Concept of a Cohort:

• Birth cohort: All persons born in the same year (e.g., birth cohort of 2010)
• Exposure cohort: Persons exposed to a drug, vaccine, or infection within a defined period
• Marriage cohort: Persons married in the same period

Framework:

• Relative Risk (RR) = [a/(a+b)] ÷ [c/(c+d)]
• RR > 1 = exposure associated with increased disease risk

Assembling the Cohort - Key Principles:

• Both cohorts must be free from the disease at study start
• Both groups should be equally susceptible to the disease
• Both groups must be comparable for all confounding variables
• Diagnostic and eligibility criteria defined beforehand

Indications for Cohort Studies:

• Good preliminary evidence of exposure-disease association (from descriptive or case-control studies)
• Exposure is rare but incidence of disease is high among exposed (e.g., industrial exposures, X-ray radiologists)
• Attrition can be minimized (stable, cooperative, accessible cohort)
• Ample funds available

Types of Cohort Sources:

• Special groups: Occupational groups, insurance policyholders (homogeneous, accessible, easy follow-up)
• Exposure groups: Workers in high-risk industries, radiologists exposed to X-rays

Data Collection in Cohort Studies:

1. Cohort members - personal interviews or mailed questionnaires (e.g., Doll & Hill used mailed questionnaires to collect smoking histories from British doctors)
2. Review of records - medical records (radiation dose, surgical details)
3. Medical examination/special tests - BP, serum cholesterol, ECG
4. Environmental surveys - exposure levels in the environment

Advantages of Cohort Studies:

• Can calculate true incidence and relative risk
• Establishes temporal sequence (exposure before disease)
• Can study multiple outcomes of a single exposure
• Less subject to bias in exposure measurement
• Provides complete data on the natural history of disease

Disadvantages:

• Expensive and time-consuming (especially for chronic diseases)
• Large numbers required
• Attrition (loss to follow-up) can bias results
• Not suitable for rare diseases
• Exposure status or habits may change during follow-up

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Case-Control vs. Cohort - Key Comparison

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3. Experimental Studies (Interventional)

Randomized Controlled Trial (RCT)

• Gold standard for testing interventions (drugs, vaccines, procedures)
• Participants randomly allocated to treatment or control group
• Randomization controls for both known and unknown confounders
• Can be blinded (single, double, triple blind) to reduce bias

Field Trials

• Conducted in the general community rather than clinical settings
• Used to evaluate preventive measures (e.g., vaccine efficacy in healthy people)

Community Trials

• The unit of randomization and intervention is a community, not an individual
• Used when the intervention must be applied at a population level (e.g., water fluoridation)

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Evidence Hierarchy (Pyramid)

     ▲  STRONGEST
     │
     │  Systematic Reviews & Meta-analyses
     │  Randomized Controlled Trials (RCTs)
     │  Cohort Studies
     │  Case-Control Studies
     │  Cross-Sectional Studies
     │  Case Reports / Case Series
     │  Expert Opinion / Editorials
     ▼  WEAKEST

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Key Measures Used in Epidemiological Studies

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Recent PubMed Examples of Each Study Design

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1. Cross-Sectional Study (Prevalence Study)

• Enrolled 9,673 US adults from the NHANES database (2011-2020) at a single point in time
• Measured TyG-BMI (an insulin resistance surrogate) and depression prevalence (PHQ-9 scale) simultaneously
• Applied multivariate logistic regression to assess association

• Single examination of a population snapshot (one time point)
• Measures prevalence, not incidence
• Exposure (TyG-BMI) and outcome (depression) measured simultaneously
• Cannot establish temporal sequence - which came first, insulin resistance or depression, cannot be determined

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2. Case-Control Study (Retrospective)

• Cases: 13,554 patients diagnosed with microscopic colitis (MC) in Sweden (1981-2017), sourced from Swedish pathology registers
• Controls: 64,886 controls randomly selected from the general population, matched for birth year, sex, county of residence, and calendar year
• Looked backwards at prior cholecystectomy rates in both groups
• Calculated Adjusted Odds Ratios (aOR) using conditional logistic regression

• Both exposure (cholecystectomy) and outcome (MC) had already occurred
• Proceeds effect → cause (retrospective)
• Uses matched controls to isolate the exposure variable
• Matching variables: birth year, sex, county, calendar year (to control confounding)
• Outcome measure: Odds Ratio

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3. Prospective Cohort Study

• Enrolled 103,449 participants from the UK Biobank (aged 40-69, recruited 2006-2010), all free of acute pancreatitis at baseline
• Measured Mediterranean Diet (MedDiet) adherence via 24-h dietary recalls at the start
• Followed participants for a mean 10.4 years, identifying incident acute pancreatitis (AP) cases through electronic medical records
• Used Cox proportional hazards models to calculate Hazard Ratios (HR)
• Also assessed interaction with genetic risk (polygenic risk score)

• Cohort was identified before disease appeared (no AP at baseline)
• Proceeds cause → effect (exposure measured first, then disease tracked)
• True incidence (371 new cases over 10.4 years) was measured
• Measure of association: Relative Risk / Hazard Ratio (not Odds Ratio)
• Long follow-up period - characteristic of cohort studies for chronic/non-communicable diseases

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4. Randomized Controlled Trial (RCT)

• 28 adults with Type 1 diabetes were randomly allocated to receive either weekly semaglutide (up to 1 mg) OR placebo as adjunct to an automated insulin delivery (AID) system
• Double-blind design: neither participants nor assessors knew the allocation
• Crossover design: each participant received both interventions in different periods (acts as their own control)
• Primary outcome: % time spent in glucose target range (3.9-10.0 mmol/L) during the last 4 weeks of each intervention

• Investigator controls the exposure (not just observes)
• Participants randomly assigned to intervention or control (controls confounding)
• Double blinding eliminates observer and performance bias
• The gold standard for testing therapeutic interventions
• ClinicalTrials.gov registered: NCT05205928

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5. Systematic Review & Meta-Analysis

• Searched PubMed, EMBASE, and Scopus up to April 2025
• Identified 226 articles comprising 1.5 million incident cancers from prospective studies across 25 cancer types
• Pooled data from multiple individual studies using meta-analytic methods to calculate summary effect estimates

• BMI was positively associated with risk of 19 cancers and inversely associated with 3
• New associations identified: leukaemia, non-Hodgkin lymphoma, bladder cancer, glioma
• Associations varied by region and sex (e.g., stronger for postmenopausal breast cancer in East Asia)
• Genetic (Mendelian randomization) findings were consistent with observational associations

• Systematically searched multiple databases with pre-defined criteria
• Pooled data across studies to generate a single summary estimate with greater statistical power
• Represents the top of the evidence hierarchy - synthesizes the best available evidence
• Can detect associations and subgroup differences not visible in individual studies

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Summary Table

• Copyright infringement - these are commercially published books/materials protected under copyright law
• Distributing exam-related materials that may include previous question papers in ways not authorized by the publisher or university

1. Explain any topic from your 3rd year MBBS syllabus (PSM/Community Medicine, Pharmacology, Pathology, Microbiology, Forensic Medicine, ENT, Ophthalmology) using authoritative medical textbooks in my library
2. Answer practice questions and explain the reasoning behind correct answers
3. Summarize high-yield topics for RGUHS 3rd year examinations based on the standard curriculum
4. Search PubMed for evidence-based content on any clinical topic you're studying

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Community Medicine (PSM) - 3rd Year MBBS

Short Notes Study Guide | RGUHS

Syllabus coverage: Based on RGUHS Phase III Part I curriculum + high-yield topics for university theory exams. Reference: Park's Textbook of Preventive and Social Medicine

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UNIT 1: EPIDEMIOLOGY

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1.1 Study Designs (Short Note)

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1.2 Screening (Short Note) ⭐ High Yield

• Sensitivity = a/(a+c) × 100 — ability to detect true positives ("Positive in Disease" = PID)
• Specificity = d/(b+d) × 100 — ability to exclude true negatives ("Negative in Health" = NIH)
• PPV = a/(a+b) — probability that a positive test = true disease
• NPV = d/(c+d) — probability that a negative test = truly disease-free

1. Important health problem
2. Natural history known
3. Recognisable latent or early symptomatic stage
4. Suitable test available
5. Test acceptable to population
6. Agreed policy on whom to treat
7. Facilities for diagnosis and treatment available
8. Recognised treatment for disease
9. Cost-benefit favourable
10. Case-finding continuous process

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1.3 Measures of Disease Frequency (Short Note) ⭐ Very High Yield

• High incidence + short duration = low prevalence (e.g., common cold)
• Low incidence + long duration = high prevalence (e.g., diabetes, leprosy)

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1.4 Epidemic Investigation (Short Note)

1. Verify the diagnosis
2. Confirm the epidemic
3. Define a case (case definition)
4. Find cases systematically (active case search)
5. Tabulate by person, place, time
6. Plot epidemic curve
7. Formulate hypothesis
8. Test hypothesis
9. Control and prevention measures

• Point source (common source): Single exposure, sharp rise and fall within one incubation period - e.g., food poisoning
• Propagated (person-to-person): Multiple waves, each separated by one incubation period - e.g., measles in a school
• Mixed: Starts as common source, then person-to-person spread

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UNIT 2: BIOSTATISTICS

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2.1 Measures of Central Tendency (Short Note) ⭐ High Yield

• ±1 SD covers 68.27% of values
• ±2 SD covers 95.45% of values
• ±3 SD covers 99.73% of values

• Positive skew (right): Mean > Median > Mode (tail on right)
• Negative skew (left): Mean < Median < Mode (tail on left)

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2.2 Statistical Tests (Short Note) ⭐ High Yield

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2.3 Sampling Methods (Short Note)

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UNIT 3: DEMOGRAPHY & VITAL STATISTICS

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3.1 Vital Statistics - Key Definitions ⭐ Very High Yield

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3.2 Demographic Cycle (Transition) (Short Note) ⭐ High Yield

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UNIT 4: ENVIRONMENT & HEALTH

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4.1 Water - Standards & Purification (Short Note) ⭐ High Yield

1. Storage / Sedimentation (removes 75-90% bacteria)
2. Coagulation / Flocculation (alum 5-40 mg/L)
3. Filtration (slow sand filter - removes 98-99% bacteria)
4. Disinfection (chlorination)

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4.2 Air Pollution (Short Note)

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4.3 Solid Waste Management (Short Note)

• Yellow bag: Anatomical/pathological waste - incineration
• Red bag: Contaminated recyclable waste - autoclaving
• Blue/White container: Sharps - puncture-proof, shredding/encapsulation
• Black bag: General waste - landfill

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UNIT 5: NUTRITION

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5.1 Protein-Energy Malnutrition (PEM) (Short Note) ⭐ Very High Yield

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5.2 Vitamin Deficiency Diseases (Short Note) ⭐ High Yield

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5.3 Iodine Deficiency Disorders (IDD) (Short Note)

• Spectrum: Goitre, cretinism, deaf-mutism, hypothyroidism, mental retardation
• Most sensitive indicator of IDD: Urinary iodine excretion
• Prevention: Iodized salt (30 ppm at production, 15 ppm at consumer level)
• National Iodine Deficiency Disorders Control Programme (NIDDCP): All edible salt to be iodized in India

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UNIT 6: MATERNAL & CHILD HEALTH

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6.1 Antenatal Care Schedules (Short Note) ⭐ High Yield

• 1st: Within 12 weeks
• 2nd: 14-26 weeks
• 3rd: 28-34 weeks
• 4th: 36 weeks to term

• TT-1: Early pregnancy; TT-2: 4 weeks after TT-1; TT-booster: if previously immunized
• IFA: 1 tablet daily from 12 weeks (100 mg elemental iron + 500 mcg folic acid)

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6.2 Immunization Schedule (Short Note) ⭐ Very High Yield

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UNIT 7: NATIONAL HEALTH PROGRAMS

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7.1 Key National Programs at a Glance ⭐ Very High Yield

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7.2 RNTCP / NTEP - Short Notes ⭐ High Yield

• Category I (new cases): 2(HRZE)/4(HR) - 6 months
• Category II (previously treated): 2(HRZES)/1(HRZE)/5(HRE) - 8 months
• NTEP (2020): All new cases get 4-drug fixed dose combination (FDC): HRZE for 2 months, HR for 4 months

• Sputum smear microscopy (ZN stain, fluorescence microscopy)
• CBNAAT (Cartridge Based Nucleic Acid Amplification Test) - rapid diagnosis + detects RIF resistance
• Culture: Gold standard (LJ medium)

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7.3 Malaria - Short Notes ⭐ High Yield

• P. vivax: Chloroquine + Primaquine (14 days)
• P. falciparum: Artemisinin-based Combination Therapy (ACT) + Primaquine (single dose)

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UNIT 8: HEALTH EDUCATION & COMMUNICATION

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8.1 Health Education Methods (Short Note)

1. Assess the problem and community needs
2. Identify target population
3. Set objectives
4. Select appropriate methods and media
5. Implement
6. Evaluate

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8.2 Socioeconomic Status (SES) Scales (Short Note) ⭐ High Yield

• Class I: Upper; Class II: Upper middle; Class III: Middle; Class IV: Lower middle; Class V: Lower

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UNIT 9: OCCUPATIONAL HEALTH

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9.1 Occupational Lung Diseases (Short Note) ⭐ High Yield

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UNIT 10: NON-COMMUNICABLE DISEASES

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10.1 Epidemiology of Hypertension (Short Note) ⭐ High Yield

• Normal: < 120/80 mmHg
• Pre-hypertension: 120-139/80-89
• Stage 1 HTN: 140-159/90-99
• Stage 2 HTN: ≥160/≥100

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10.2 Epidemiology of Diabetes Mellitus (Short Note)

• Fasting plasma glucose ≥ 126 mg/dL
• 2-hr post-glucose ≥ 200 mg/dL (OGTT)
• Random plasma glucose ≥ 200 mg/dL + symptoms
• HbA1c ≥ 6.5%

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QUICK REVISION TABLE: Exam Frequently Asked Short Notes

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Tip: This guide covers ~80% of expected short note questions in RGUHS 3rd year theory papers. For LAQs (Long Answer Questions), expand on Epidemiology (study designs + epidemic investigation), National Health Programs (RNTCP/NTEP, Malaria, Immunization), and Biostatistics (statistical tests + sampling). Ask me to expand any section!

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RGUHS Community Medicine (PSM) - Previous Year Questions with Explanations

Exam pattern (RS4 CBME scheme): 2 papers × 100 marks each | Long Essay (LAQ) = 10 marks each | Short Essay = 5 marks each | Short Answer = 3 marks each | MCQ = 1 mark each | Pass: 50% aggregate, min 40% per paper

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PAPER I - FREQUENTLY REPEATED QUESTIONS

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LAQ 1: Enumerate the indicators of health. Describe all mortality indicators with suitable examples. What are the methods of standardization of mortality rate? (RGUHS 2012 - 10 marks)

1. Mortality indicators - CBR, CDR, IMR, MMR, etc.
2. Morbidity indicators - Incidence rate, prevalence rate, notification rate
3. Disability indicators - Days lost due to illness, DALY
4. Nutritional indicators - weight/age, height/age, BMI
5. Healthcare indicators - doctor:population ratio, hospital beds:population
6. Socioeconomic indicators - literacy rate, per capita income, % below poverty line
7. Health policy indicators - % GDP spent on health, % primary health care budget

• Direct standardization: Apply observed age-specific rates to a standard population
• Indirect standardization: Apply standard age-specific rates to the actual population → gives Standardized Mortality Ratio (SMR) = (Observed deaths / Expected deaths) × 100
  • SMR > 100 = higher mortality than standard
  • SMR < 100 = lower mortality than standard

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LAQ 2: Describe screening for diseases — definition, types, uses, criteria for selection of disease and test (RGUHS 2012 - 10 marks)

• Mass screening: Entire population screened
• Selective/High-risk screening: Only at-risk groups (e.g., smokers for lung cancer)
• Multiphasic screening: Multiple tests applied at one time
• Opportunistic screening: When patient attends for another reason

1. Early detection and treatment of disease
2. Interrupting spread of communicable disease
3. Identifying high-risk groups for intervention
4. Research and epidemiological studies

1. Important health problem (high prevalence/morbidity)
2. Accepted treatment for patients
3. Facilities for diagnosis and treatment available
4. Recognisable latent or early symptomatic stage
5. Suitable test or examination available
6. Test acceptable to the population
7. Natural history adequately understood
8. Agreed policy on whom to treat
9. Cost economically balanced in relation to healthcare expenditure
10. Case-finding is a continuing process

• Sensitivity = a/(a+c) × 100 → "PID" — detects true cases
• Specificity = d/(b+d) × 100 → "NIH" — correctly excludes healthy
• PPV = a/(a+b) × 100 → increases with higher disease prevalence
• NPV = d/(c+d) × 100 → high when disease prevalence is low

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LAQ 3: What is Health Education? How will you organise a Health Education session on Anaemia for village women? (RGUHS 2012 - 10 marks)

• Women will list 3 iron-rich foods by end of session
• Women will demonstrate correct IFA tablet usage

• Definition and symptoms of anaemia (pallor, fatigue, breathlessness)
• Causes: iron deficiency, hookworm, malaria, poor diet
• Iron-rich foods: green leafy vegetables, jaggery, dates, meat, eggs
• Inhibitors of iron absorption: tea, coffee, phytates
• Enhancers: Vitamin C (citrus fruits, amla)
• IFA supplementation under national programs (weekly IFA for adolescent girls under WIFS scheme)
• When to seek care

• Group discussion at anganwadi centre (max 15 women)
• Flannel graph / flip charts showing iron-rich foods
• Food demonstration (cooking iron-rich recipes)
• Role play (ASHA demonstrating IFA tablet use)

• Immediate: KAP questions post-session
• Intermediate: Repeat Hb estimation at 3 months
• Long-term: Change in anaemia prevalence

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LAQ 4: Carrier of infection — types, examples, control measures (RGUHS 2012 - 10 marks)

1. Detection: Stool cultures, serological tests, contact tracing
2. Treatment: Appropriate antibiotics (e.g., ampicillin for typhoid carriers; cholecystectomy in biliary carriers)
3. Notification: Report to health authorities
4. Health education: Personal hygiene, hand washing
5. Restriction: Carriers excluded from food-handling jobs (typhoid carriers)
6. Follow-up: Repeated cultures to confirm clearance

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PAPER II - FREQUENTLY REPEATED QUESTIONS

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LAQ 5: Epidemiology, clinical features, prevention and control of Measles (RGUHS 2013 - 10 marks)

• Source: Cases (infected persons); no carrier state
• Mode of transmission: Droplet infection (most important), direct contact
• Incubation period: 10-14 days (average 12 days)
• Infectious period: 4 days before to 5 days after rash appears
• Herd immunity threshold: 95% (highly infectious, R₀ = 12-18)
• Seasonality: Winter-spring in temperate countries; no seasonal pattern in tropics

• Prodromal stage (3-4 days): Fever, cough, coryza, conjunctivitis
• Koplik's spots: Pathognomonic - small white spots on buccal mucosa (appear before rash)
• Rash: Maculopapular, starts at hairline/forehead, spreads downwards; fades in order of appearance; brownish discolouration (Pastia's lines)

1. Vaccination: MR vaccine at 9 months (MR-1) and 16-24 months (MR-2) under UIP; 95% coverage needed for herd immunity
2. Vitamin A supplementation: At time of vaccination reduces severity
3. Case isolation: For 5 days after rash appearance
4. Contact tracing and vaccination of susceptibles
5. Measles elimination target: India aims to eliminate measles by 2023

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LAQ 6: Causes of Maternal Mortality in India. Preventive and control measures for reduction of MMR (RGUHS 2013 - 10 marks)

1. Haemorrhage (25%) - PPH most common (atonic uterus)
2. Hypertensive disorders (eclampsia, pre-eclampsia) - 14%
3. Sepsis/infection - 15%
4. Unsafe abortion - 8% (India)
5. Obstructed labour
6. Anaemia (indirect cause - responsible for ~20% maternal deaths in India)

• ASHA mobilisation for ANC registration and institutional delivery
• Janani Suraksha Yojana (JSY) - cash incentive for institutional delivery
• JSSK - free delivery, drugs, transport
• PMSMA - free comprehensive ANC on 9th of every month
• SUMAN - zero-denial, respectful maternity care

• Minimum 4 ANC visits (WHO: 8 contacts)
• Early detection of high-risk pregnancies (anaemia, hypertension, malpresentation)
• Skilled birth attendance at every delivery
• Emergency Obstetric Care (EmOC) at FRUs
• Blood banks / storage centres at FRUs
• 24-hour delivery services at CHCs

• Maternal Death Review (MDR) - facility and community-based
• LaQshya programme - quality improvement in labour rooms
• Anaemia Mukt Bharat - IFA supplementation to prevent anaemia

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FREQUENTLY REPEATED SHORT ESSAY QUESTIONS (5 marks each)

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SE 1: Epidemiology and control of Malaria

• Causative agents: P. falciparum (malignant tertian, most dangerous), P. vivax, P. malariae (quartan), P. ovale
• Vector: Female Anopheles mosquito; breeds in clear, unpolluted water; bites dusk/night
• Incubation: P. vivax = 14 days | P. falciparum = 12 days | P. malariae = 28 days
• Indices: Spleen rate, parasite rate, API, ABER, SPR
• Treatment: P. vivax → Chloroquine + Primaquine (14d) | P. falciparum → ACT + Primaquine (single dose)
• Control: IRS (DDT/synthetic pyrethroids), LLINs, larval control, personal protection

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SE 2: Validity of a screening test

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SE 3: Demographic Cycle (Demographic Transition Theory)

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SE 4: Pneumoconioses (write a short note)

• Silicosis (SiO₂) - most common
• Anthracosis (coal) | Asbestosis (asbestos) | Byssinosis (cotton) | Bagassosis (sugarcane) Prevention: Dust suppression, wet drilling, PPE, periodic medical exams, pre-employment and periodic X-rays

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SE 5: Indicators of MCH care

• Maternal: MMR, % deliveries by skilled birth attendant, % with 4 ANC visits
• Child: IMR, NMR, PMR, under-5 MR
• Fertility: TFR, GFR, NRR
• Programme: % fully immunised, % institutional deliveries, JSSK coverage

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SE 6: Investigation of food poisoning in a hostel (RGUHS 2009)

1. Confirm diagnosis (clinical + lab)
2. Define case and count cases
3. Identify the food vehicle (food history, attack rates for each food item)
4. Collect samples: stool, vomitus, suspected food, water
5. Identify source and causative agent
6. Control: Remove suspected food, treat cases, disinfect kitchen
7. Preventive: Food handler training, proper food storage, cooking temperatures

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SE 7: Principles of Primary Health Care (Alma Ata 1978)

• Community participation
• Appropriate technology
• Food/nutrition
• Education about health
• Water and sanitation
• Immunisation
• Control of endemic diseases
• Health care (MCH + family planning)

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SE 8: Normal curve and Normal distribution

• Mean = Median = Mode
• ±1 SD = 68.27% | ±2 SD = 95.45% | ±3 SD = 99.73%
• Uses: Calculating reference ranges, statistical tests, z-scores
• Skewed = departure from normality (positively or negatively skewed)

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WHERE TO FIND MORE RGUHS PYQs

Pro tip: Ask me to write a full answer to any of these questions and I'll give you a structured, mark-specific response drawn from Park's Textbook - formatted exactly as needed for RGUHS theory papers.

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Sewage Treatment Plant

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Definition of Sewage

• BOD (Biochemical Oxygen Demand): Amount of oxygen required by bacteria to stabilise decomposable organic matter aerobically. BOD ≥300 mg/L = "strong" sewage; 100 mg/L = "weak"
• COD (Chemical Oxygen Demand): Oxygen equivalent of organic matter oxidisable by a strong chemical oxidant
• Suspended Solids: 100 mg/L = weak sewage; 500 mg/L = strong sewage

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Decomposition of Organic Matter in Sewage

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Modern Sewage Treatment Plant

SEWAGE INFLOW
     │
     ▼
┌─────────────────────────────────┐
│      PRIMARY TREATMENT          │  ← Removes SOLIDS (physical)
│  1. Screening                   │
│  2. Grit Chamber                │
│  3. Sedimentation Tank          │
│     (Imhoff tank / septic tank) │
└─────────────────────────────────┘
     │ Effluent
     ▼
┌─────────────────────────────────┐
│      SECONDARY TREATMENT        │  ← Removes ORGANIC MATTER (biological)
│  1. Trickling Filter            │
│  2. Activated Sludge Process    │
└─────────────────────────────────┘
     │ Treated Effluent
     ▼
  DISPOSAL / REUSE

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a. PRIMARY TREATMENT

1. Screening

• First step: sewage passed through a metal screen with vertical/inclined steel bars set 5 cm apart
• Removes large floating objects (wood, rags, garbage, dead animals)
• Prevents clogging of the treatment plant
• Screenings disposed of by trenching or burial

2. Grit Chamber (Detritus Chamber)

• Long narrow chamber, 10-20 metres in length
• Maintains constant velocity of ~1 foot/second, detention period 30 seconds to 1 minute
• Settles heavier inorganic solids: sand, gravel, broken glass, grit
• Allows lighter organic particles to pass through
• Grit removed and disposed of as fill material

3. Sedimentation (Primary Sedimentation Tank)

• Sewage passes into a large quiescent tank (detention time 1.5-2 hours)
• ~60-65% of suspended solids removed by gravity settling
• Settled material = raw sludge → goes to sludge digestion tank
• Floating material removed by skimmers

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b. SECONDARY TREATMENT

1. Trickling Filter (Percolating / Biological Filter)

• A bed of coarse crushed stone or gravel (1.5-3 m deep) in a circular tank
• Sewage is sprayed over the surface through rotating sprinkler arms
• A gelatinous film (zoogloeal film) of aerobic bacteria, fungi, algae, and protozoa grows on the stones
• Organic matter in the effluent is oxidized as it trickles down through this film
• Produces a stable, odourless effluent (humus)
• Efficiency: removes 80-90% of BOD

2. Activated Sludge Process

• Sewage mixed with activated sludge (sludge rich in aerobic bacteria) in an aeration tank
• Air blown through the mixture for 4-8 hours → aerobic bacteria break down organic matter
• Mixture passes to secondary settling tank → sludge settles and most is returned to aeration tank (hence "activated") to seed new incoming sewage
• Excess sludge → sludge digestion tank → disposed as manure or dried
• Produces a very clean effluent with BOD reduction of 85-95%

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c. OTHER METHODS OF SEWAGE DISPOSAL

(i) Sea Outfall

• Dilution of sewage in seawater — suitable only for coastal cities
• Self-purification by dilution, UV from sunlight, bactericidal action of seawater
• Must be discharged far enough from shore to prevent beach contamination

(ii) River Outfall

• Discharge into rivers; depends on self-purification capacity of the river
• Must satisfy the dilution factor and the oxygen sag curve criteria
• Not recommended unless river has very high dilution capacity

(iii) Sewage Farming (Land Application)

• Treated sewage used for irrigation of land (grows crops)
• Soil acts as a filter; organic matter fertilises the soil
• Only crops not eaten raw (fodder, fibre crops) should be grown on raw sewage farms
• Vegetables eaten raw must only use well-treated effluent

(iv) Oxidation Ponds (Stabilisation Ponds)

• Open, shallow ponds 1-1.5 m deep with inlet and outlet
• Requires three components: (1) algae + (2) bacteria + (3) sunlight
• Mutualistic cycle: Bacteria oxidize organic matter → produce CO₂ + minerals → algae use these with sunlight for photosynthesis → produce O₂ → bacteria use O₂ to oxidize more organic matter
• Predominantly aerobic during daylight hours; bottom layers anaerobic at night
• No odour nuisance when properly maintained
• Suitable for small communities
• Effluent can be used for land irrigation

(v) Oxidation Ditches

• Use mechanical rotors for extended aeration
• For populations of 5,000-20,000
• Requires only 1 acre vs 22 acres for an oxidation pond
• Low-cost treatment method

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Sludge Disposal

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Summary Comparison of Secondary Treatment Methods

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Exam High-Yield Points ⭐

• BOD = primary indicator of sewage strength; normal sewage = 200-300 mg/L
• Primary treatment = physical removal of solids (screening → grit → sedimentation)
• Secondary treatment = biological oxidation of dissolved organic matter
• Imhoff tank = combined sedimentation + sludge digestion in one unit
• Trickling filter = zoogloeal film on stones; activated sludge = returned active bacteria
• Oxidation pond = algae-bacteria symbiosis + sunlight; suitable for small communities
• Sewage farming: only non-edible raw crops on raw sewage; treated effluent for vegetables

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Levels & Modes of Prevention — Complete Notes

PRE-PATHOGENESIS          ──────────────  PATHOGENESIS PHASE  ──────────────▶
(No disease yet)          Early disease   Advanced disease   Outcome

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NATURAL HISTORY OF DISEASE PHASES

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LEVEL 1: PRIMORDIAL PREVENTION

• Mass/individual health education discouraging harmful lifestyles
• Healthy public policy (e.g., ban on tobacco advertising)
• Promoting healthy lifestyle habits in children before risk factors develop
• Socioeconomic development, food security

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LEVEL 2: PRIMARY PREVENTION

(A) Health Promotion

• Health education
• Nutritional interventions (food distribution, supplementation, fortification)
• Environmental modifications (safe water, sanitation, housing, vector control)
• Lifestyle and behavioural changes

(B) Specific Protection

• Immunization (vaccines — most powerful specific protection)
• Chemoprophylaxis (e.g., anti-malarials, INH for TB contacts)
• Protection from occupational hazards (PPE, dust control)
• Use of seatbelts / crash helmets
• Fluoridation of water (dental caries prevention)
• Protection from carcinogens
• Elimination of environmental risks

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LEVEL 3: SECONDARY PREVENTION

(A) Early Diagnosis

• Mass screening programmes (e.g., cervical cancer, hypertension)
• Periodic health check-ups
• Selective examinations of high-risk groups
• Case-finding (active search for cases)
• Self-examination (e.g., breast self-examination)

(B) Prompt Treatment

• Adequate treatment to cure disease / arrest progression
• Prevent complications
• Prevent spread to others (reverse communicability)
• Prevent sequelae

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LEVEL 4: TERTIARY PREVENTION

(A) Disability Limitation

• Treatment of established disease to prevent further deterioration
• Prevent progression to complete disability
• Adequate therapy at clinical level
• Example: Treatment of diabetic retinopathy to prevent blindness

(B) Rehabilitation

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Summary Table (Park's Table 10)

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Key Exam Points ⭐

• Primordial = newest concept; specific to NCDs and chronic diseases; prevents risk factors (not disease itself)
• Primary = prevents incidence; operates in pre-pathogenesis
• Secondary = reduces prevalence; operates in early pathogenesis; key tool = screening
• Tertiary = reduces disability; operates in late pathogenesis/outcome
• Rehabilitation = part of tertiary prevention, not separate from it
• Health promotion and specific protection are the two sub-modes of primary prevention

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RGUHS Community Medicine Paper I — 22 May 2023 (Q.P. Code 1035)

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LONG ESSAYS (10 marks each)

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Q1. A 38-year-old man — stone quarry worker — dyspnoea — "snow-storm" X-ray appearance. Describe epidemiology, preventive and control measures.

Definition

Epidemiology

Pathology

• Silica particles phagocytosed by macrophages → macrophage death → release of fibrogenic factors → nodular fibrosis
• Progressive massive fibrosis (PMF) in advanced disease
• X-ray: Multiple small nodular opacities (snow-storm pattern) in both lung fields; "eggshell calcification" of hilar lymph nodes

Clinical Features

• Progressive dyspnoea (insidious onset, worsens over years)
• Dry cough, chest tightness
• Silico-tuberculosis: silicosis greatly increases TB risk (3x)
• Cor pulmonale in advanced cases

Preventive & Control Measures

• Substitution: Replace silica with safer abrasives (steel grit, glass beads)
• Wet drilling / wet methods: Suppression of dust by water sprays at point of dust generation
• Enclosure and isolation: Enclose dusty processes; isolate workers
• Local exhaust ventilation (LEV): Exhaust systems to capture dust at source
• General dilution ventilation: Fresh air circulation in enclosed mines

• Respirators/dust masks (NIOSH-approved)
• Regular replacement of filter elements

• Pre-employment medical examination + chest X-ray
• Periodic medical examination (every 6-12 months)
• Lung function tests (spirometry)
• Early removal from exposure if disease detected

• Mines Act 1952; Factories Act 1948
• Workmen's Compensation Act
• Dust exposure limits: Threshold Limit Value (TLV) for silica dust

• Workers educated on hazards, use of PPE, importance of periodic check-ups

• No specific cure; treatment of complications
• Anti-TB drugs if silico-TB develops
• Bronchodilators for symptom relief
• Whole-lung lavage in selected cases

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Q2. Define epidemiology. Classify epidemiological study designs. Describe steps in conducting a case-control study using smoking and lung cancer as an example.

Definition of Epidemiology

Classification of Epidemiological Study Designs

EPIDEMIOLOGICAL STUDIES
         │
         ├── OBSERVATIONAL (no intervention by investigator)
         │        │
         │        ├── Descriptive
         │        │      ├── Case reports / Case series
         │        │      └── Cross-sectional (prevalence study)
         │        │
         │        └── Analytical
         │               ├── Case-Control (retrospective)
         │               └── Cohort (prospective / retrospective)
         │
         └── EXPERIMENTAL (investigator intervenes)
                  ├── Randomized Controlled Trial (RCT)
                  ├── Field trial
                  └── Community trial

Case-Control Study — Steps (Smoking & Lung Cancer)

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SHORT ESSAYS (8 marks each)

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Q3. Different types of disinfection with suitable examples

Types of Disinfection

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Q4. Define an epidemic. Classify epidemics with suitable examples.

Classification of Epidemics

• Explosive epidemic: Sudden rise, all cases within one incubation period (e.g., food poisoning, chemical poisoning)
• Slow/gradual epidemic: Rises over weeks/months (e.g., AIDS, hepatitis B)

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Q5. Define overcrowding. Role in impact on health and disease.

Health Effects of Overcrowding

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Q6. Describe incineration of biomedical waste.

Types of Incinerators

Process (Double-chamber):

1. Primary chamber (800-900°C): Waste is combusted in limited oxygen → pyrolytic decomposition
2. Secondary chamber (900-1200°C): Gases from primary chamber fully oxidized → destroys toxic organic compounds, dioxins
3. Flue gas treatment: Scrubbers, filters to remove pollutants before discharge
4. Residual ash: Sent to secured landfill

Biomedical Waste Categories Suitable for Incineration (BMW Rules 2016):

• Yellow bag: Anatomical waste, soiled dressings, pathological waste
• Red bag: Contaminated recyclable waste (if non-recyclable)
• NOT suitable: Radioactive waste, cytotoxic waste, pressurised containers

Advantages

• 90-95% volume reduction
• Complete pathogen destruction
• Can generate energy (waste-to-energy)

Disadvantages

• Releases dioxins, furans, heavy metals if not properly operated
• High installation and running costs
• Requires trained operators
• Air pollution if inadequate flue gas treatment

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Q7. Describe the natural history of disease with suitable examples.

Phases of Natural History

• No disease yet; interaction of agent, host, and environment
• Risk factors present (e.g., smoking, obesity, hypertension)
• Stimulus for disease not yet active in host
• Example (TB): M. tuberculosis in environment + susceptible host; exposure not yet occurred

Key Concepts

• Iceberg phenomenon: Only tip visible (clinical cases); submerged base = sub-clinical/inapparent cases. Most infections show this (polio, TB, hepatitis)
• Spectrum of disease: From inapparent → mild → moderate → severe → fatal
• Herd immunity: Related to the proportion of population susceptible
• Prepathogenesis = point for primary prevention; early pathogenesis = secondary prevention

• Pre-pathogenesis: Smoking, obesity, hypertension, hyperlipidaemia present
• Early pathogenesis: Atherosclerosis developing; stress ECG abnormal
• Advanced: Angina, MI symptoms
• Outcome: Recovery with thrombolytics / permanent cardiac damage / death

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Q8. Enumerate nutritional assessment methods. Describe any one in detail.

Methods of Nutritional Assessment (ABCD)

Anthropometric Assessment in Detail

• Stunting = chronic malnutrition (<95% of median height-for-age)

• Wasting = acute malnutrition (<90% of median weight-for-height)

• <18.5 = Underweight; 18.5-24.9 = Normal; ≥25 = Overweight; ≥30 = Obese

• <12.5 cm = Severe acute malnutrition (SAM) in children 6-59 months
• 12.5-13.5 cm = Moderate acute malnutrition (MAM)

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Q9. Describe the process of communication. Enumerate communication barriers.

Process of Communication (Berlo's SMCR Model)

SOURCE → MESSAGE → CHANNEL → RECEIVER → FEEDBACK
  │          │          │          │
Encoder    Content    Medium    Decoder

1. Source (Communicator): Health worker, doctor, teacher with knowledge, attitude, communication skills
2. Message: The health information encoded into words, symbols, or images; must be clear, accurate, relevant, simple
3. Channel: Medium of transmission — interpersonal (face-to-face), mass media (TV, radio), print (posters, leaflets), electronic
4. Receiver (Audience): Must decode and understand the message; influenced by education, culture, beliefs
5. Feedback: Response from receiver back to source — confirms understanding; allows correction

Types of Communication

• Interpersonal: One-to-one counselling (most effective for behaviour change)
• Group communication: Health talks, demonstrations
• Mass communication: Radio, TV, newspapers (reaches many but less personal)

Communication Barriers

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Q10. Identify the causes and solutions for population explosion in India.

Causes

Solutions

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SHORT ANSWERS (3 marks each)

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Q11. List three aims of epidemiology

1. To describe the distribution and magnitude of health and disease problems in the community (who, when, where)
2. To identify the determinants (causes and risk factors) of disease in order to explain its distribution
3. To provide data for planning, implementing, and evaluating public health interventions for prevention and control of disease

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Q12. Draw a pie chart with a suitable example

         Preterm (35%)
          ___________
         /     *     \
        |   35%  PIE  |  ← Draw circle; divide by proportional sectors
        |     CHART   |     Each sector angle = (% × 360°) / 100
         \___________/

Preterm: 126°  |  Asphyxia: 90°  |  Sepsis: 54°
Pneumonia: 36° |  Diarrhoea: 29° |  Other: 25°

• Draw a circle; divide into sectors proportional to angle (% × 3.6°)
• Label each sector with name and percentage
• Title: "Causes of Infant Mortality in India"
• Used for: Displaying parts of a whole; best when categories are 3-7

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Q13. Enumerate the dimensions of health

1. Physical dimension — Biological soundness; organs functioning normally
2. Mental dimension — Ability to think clearly, manage emotions, cope with stress
3. Social dimension — Ability to make and maintain relationships; social functioning
4. Spiritual dimension — Sense of purpose, meaning, inner peace, moral values
5. Emotional dimension — Ability to express and control emotions appropriately
6. Vocational dimension — Ability to perform productive work/occupation

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Q14. Methods for prevention and control of noise pollution

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Q15. Common nutritional disorders in India

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Q16. Define herd immunity with an example

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Q17. Enumerate the contents of health education

1. Nutrition and food hygiene — balanced diet, safe food preparation, breastfeeding
2. Personal hygiene — handwashing, oral hygiene, skin care, menstrual hygiene
3. Environmental sanitation — safe water, latrine use, garbage disposal, vector control
4. Maternal and child health — ANC, immunization, family planning, birth spacing
5. Communicable disease prevention — TB, malaria, HIV/AIDS, STIs
6. Non-communicable disease prevention — no tobacco, physical activity, healthy diet
7. First aid and home remedies — ORS for diarrhoea, wound care, emergency response
8. Use of health services — when to visit PHC, immunization schedule, screening
9. Family planning — methods, benefits of small family, responsible parenthood
10. Occupational health — hazards, PPE use, safe working practices

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Q18. How do you manage microbiology laboratory waste?

1. Segregation at point of generation (colour-coded containers)
2. Disinfection: Autoclaving (121°C, 15 psi, 30 min) for all microbiology waste
3. Sharps safety: Needle-stick prevention, needle destroyers, puncture-proof containers
4. Labelling: Biohazard symbol on all containers
5. Transport: Leak-proof, sealed bags to treatment area
6. Final disposal: Incineration or CBWTF (Common Biomedical Waste Treatment Facility)
7. Record keeping: Log of waste quantity, treatment method, disposal site

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Q19. List the functions of the World Health Organization (WHO)

1. Normative/standard-setting: Establishes international health standards, guidelines, and nomenclature (ICD codes, drug standards, TLVs)
2. Epidemiological surveillance: Global disease monitoring; International Health Regulations (IHR 2005); alerts for outbreaks (e.g., COVID-19, Ebola)
3. Research coordination: Promotes and coordinates biomedical and health research globally
4. Technical assistance: Provides technical support to member countries for health systems strengthening
5. Health promotion: Campaigns (World No Tobacco Day, World Health Day, vaccination weeks)
6. Emergency response: Humanitarian health aid in disasters, conflicts, epidemics (WHO GOARN)
7. Training: Human resources development; fellowships; capacity building
8. Maternal & child health: Policies for immunization, nutrition, reproductive health
9. Eradication programmes: Smallpox (eradicated 1980); polio eradication; NTD programmes
10. Publication: Weekly Epidemiological Record; World Health Statistics; global health reports

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Q20. Sathya and Jyothi — married 2 years — Reproductive health services at PHC

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