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In hot summer and cold winter, the number of malaria cases as well as Anopheles declines, reappearance of malaria in humid warm conditions is due to

1. surviving malarial parasites in human carriers
2. surviving sporozoites in surviving mosquitoes
3. monkeys
4. mosquito larvae in permanent waters

Correct answer: surviving malarial parasites in human carriers

Solution

Malaria can disappear from visible transmission during dry or cold periods, but the parasite may still persist in infected humans. When warm, humid conditions return and mosquitoes increase, these human carriers become the source for renewed spread.

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