Healthy Notes

✅ General Public Health & Epidemiology WHO Definition of Health : A state of complete physical, mental, and social well-being and not merely the absence of disease. Incidence : Number of new cases in a specific period. Prevalence : Total number of cases (new + existing). Herd Immunity : Resistance to the spread of contagious disease when a large part of the population is immune. Levels of Prevention : Primary: Health promotion (e.g., vaccination) Secondary: Early diagnosis (e.g., screening) Tertiary: Disability limitation (e.g., rehab) Primary Health Care Components : Health education Nutrition Water & sanitation MCH care Immunization Control of endemic diseases Treatment of common diseases Essential drugs Isolation vs Quarantine : Isolation : For infected persons Quarantine : For exposed but asymptomatic individuals Iceberg Phenomenon : Visible clinical cases are just a small part; subclinical cases are hid...