Epidemiology is defined as the study of1. Epidemiology 2. where a disease occurs. 3. how a disease is transmitted. 4. when a disease occurs. 5. where and when a disease occurs, and how it is transmitted.

5). where and when a disease occurs, and how it is transmitted.

Explanation: Epidemiology is a branch of medicine and the cornerstone of public health that studies the distribution and control of a disease. Epidemiology involves the study of who is affected by a disease, where is affected (the geographical location), when it is affected (time) and the used of these studies in the control of diseases and other health problems.