About the field of Epidemiology: Epidemiology is the study of the incidence, distribution, and determinants of disease in populations, particularly humans. Epidemiologists frequently fall under the umbrella of public health and are involved in the vital role of learning how to control and prevent disease. Topics of study within epidemiology generally require many math and science courses including biostatistics, immunology , biochemistry , genetics , physiology , toxicology , and more. Another aspect of epidemiology includes topics such as demography (population studies) and policy studies so that you will be prepared to interact with policy in combating disease. Other related fields include health education and promotion , health systems administration , occupational and environmental health and safety , and virology .