<prompt> In area having annual parasite index of less than 2, the following is to be done -Passive surveillance only2 rounds of DDT yearlyEntomological surveillanceAll positive cases blood smear to be done monthly  <response>: Parks textbook of preventive and social medicine 23rd edition. API is a sophisticated measure of malaria incidence in a community. It is based on intensive active and passive surveillance and cases are confirmed by blood examination. 