A malarial survey is conducted in 50 villages having a population of one lakh. Out of 20000 slides examined, 500 turned out to be malaria positive. The annual parasite incidence is –
Correct Answer: 0.50%
Description: <> -Annual parasite incidence. = confirmed cases during one year *1000 ---------------------------------------------------------- Population under surveillance (0.5%) -It is based on intensive active and passive surveillance and cases are confirmed by blood examination. Reference : Park's textbook of preventive and social medicine, 23rd edition, pg no:261 <>
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Social & Preventive Medicine
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