Incidence is the number of new cases (morbidity or mortality), usually expressed as a proportion, during a specified time period; prevalence is the total number affected in the population, again usually expressed as a… Epidemiology is the science underlying public health

Morbidity means being in a state of illness, whereas mortality refers to death; both morbidity rates and mortality rates are of interest to epidemiologists Sporadic diseases only occur rarely and largely without a geographic focus.

specified time period; prevalence — the total number affected in the population, again usually expressed as a….

Be able to explain the difference between prevalence and incidence of disease; distinguish the characteristics of sporadic, endemic, epidemic, and pandemic diseases; explain the use of Koch’s postulates and their modifications to determine the etiology of disease.