📚🦠Important Definitions and Terms Used in Epidemiology 📖 1. Epidemiology Scientific study of the distribution, determinants, and control of diseases and health conditions in a population. 📖 2. Incidence Number of new cases of a disease occurring in a defined population during a specified time period. 📖 3. Prevalence Total number of existing cases (both new and old) of a disease in a population at a given time. 📖