<prompt> In a population of 5000, number of new cases of TB is 500; old cases in the same population are 150. What is the prevalence of TB:9121318  <response>: Ans. c 13Ref: K. Park 23rd ed. 61 Prevalence is calculated asNo. of new cases no of old casesTotal Populationx 100 Therefore prevalence 500 1505000x 100 Prevalence 13Also Know Prevalence is a Proportion Incidence is a Rate 