<prompt> The following is true about prevalence and incidence:Both are ratesPrevalence is a rate but incidence is notIncidence is a rate but prevalence is notBoth are not rates  <response>: Incidence rate is defined as the number of NEW cases occurring in a defined population during a specific period of time. Disease prevalence refers specifically to all current casesold and new existing at a given point in time or over a period of time in a given population. Although referred to as a rate, prevalence rate is really a ratio. Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 68, 69 