<prompt> In a town with population of 100,000 the number of slides examined is 5000. Out of these, 100 slides were postive for malaria. The API is?2510.5  <response>: Annual parasite incodence Confirmed cases during 1 year population under surveillance x 1000 ie 100 100000 x 1000 1 Reference; Park;s Textbook of preventive and social medicine, 24th edition.Pg no. 278 