A population of 100000 is under surveillance during an year. 100 cases were positive for malarial thick smear. What is the annual parasite index ?
Ans. is 'a' i.e.,1 per 1000 Annual Parasite Incidence =(confirmed cases during one year/population under surveillancee) x 1000Population under surveillance = 100000Confirmed cases = 100 100API - x 1000 = 1 100,000So, API is 1 per 1000 population.
1 per 1000
2 per 1000
10 per 1000
20 per 1000