Social & Preventive Medicine 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 💡 Explanation In area having annual parasite index of less than 2, the following is to be done - ✓ Correct Answer: D. All positive cases blood smear to be done monthly