In area having annual parasite index of less than 2, the following is to be done -: (A) Passive surveillance only, (B) 2 rounds of DDT yearly, (C) Entomological surveillance, (D) All positive cases blood smear to be done monthly
Answer is D. Park's 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.