Unit 1367: Comprehensive Epidemiology

1. Introduction to Epidemiology

1.1 Definition and Scope

• What is epidemiology?
• Role in public health and medicine

1.2 Historical Development

• Key milestones in epidemiology
• Influential epidemiologists and landmark studies

1.3 Key Concepts

• Population health
• Disease distribution and determinants
• Epidemiologic triad: agent, host, environment

1.4 Importance of Epidemiology

• Informing public health policy
• Disease prevention and control

2. Measures of Disease Frequency

2.1 Prevalence

• Definition and formula
• Point vs period prevalence

2.2 Incidence

• Incidence proportion (risk)
• Incidence rate (incidence density)

2.3 Mortality Rates

• Crude mortality rate
• Cause-specific mortality rate
• Case fatality rate

2.4 Other Measures

• Attack rate
• Years of potential life lost (YPLL)

3. Study Designs in Epidemiology

3.1 Observational Studies

• Cross-sectional studies: characteristics, uses, strengths, limitations
• Case-control studies: design, matching, odds ratio
• Cohort studies: prospective vs retrospective, relative risk

3.2 Experimental Studies

• Randomized controlled trials (RCTs): design, randomization, blinding
• Ethical considerations

3.3 Comparative Advantages and Limitations

• When to use each study design

4. Bias and Confounding in Epidemiological Studies

4.1 Types of Bias

• Selection bias
• Information bias (recall, interviewer, misclassification)

4.2 Confounding

• Definition and examples
• Identifying confounders

4.3 Strategies to Minimize Bias and Confounding

• Design phase: randomization, restriction, matching
• Analysis phase: stratification, multivariable analysis

5. Outbreak Investigation and Response

5.1 Outbreak Detection

• Surveillance systems and signals

5.2 Steps in Outbreak Investigation

• Confirming the outbreak
• Case definition formulation
• Case finding and data collection
• Descriptive epidemiology (time, place, person)
• Hypothesis generation and testing

5.3 Control and Prevention Measures

• Implementing interventions
• Communication strategies

6. Screening and Surveillance in Epidemiology

6.1 Screening Concepts

• Purpose and principles of screening
• Types of screening tests (mass, selective, multiple)
• Characteristics of good screening tests (sensitivity, specificity, predictive values)

6.2 Surveillance Systems

• Passive vs active surveillance
• Sentinel surveillance
• Syndromic surveillance

6.3 Role in Public Health

• Monitoring trends
• Early detection of outbreaks

7. Infectious Disease Epidemiology

7.1 Modes of Transmission

• Direct and indirect transmission
• Vehicle-borne and vector-borne transmission

7.2 Outbreak Investigation Specifics

• Identifying source and mode of transmission

7.3 Prevention and Control Strategies

• Vaccination
• Quarantine and isolation
• Antimicrobial stewardship

8. Chronic Disease Epidemiology

8.1 Epidemiology of Major Chronic Diseases

• Cardiovascular diseases, cancers, diabetes

8.2 Risk Factors

• Behavioral, genetic, environmental

8.3 Trends and Surveillance

• Prevalence and incidence trends

8.4 Interventions

• Primary, secondary, and tertiary prevention

9. Environmental Epidemiology

9.1 Environmental Exposures

• Air pollution, water quality, occupational hazards

9.2 Methods in Environmental Epidemiology

• Exposure assessment
• Ecological and case-crossover studies

9.3 Public Health Policy and Regulation

• Role in setting exposure limits
• Impact on legislation and workplace safety

10. Global Health Epidemiology

10.1 Global Health Challenges

• Infectious disease outbreaks (e.g., pandemics)
• Non-communicable diseases
• Health disparities and social determinants

10.2 Impact of Globalization

• Travel, migration, trade

10.3 Epidemiology’s Role

• International surveillance and response
• Collaborations (WHO, CDC, NGOs)