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Bionomics of Anopheles minimus and its role in malaria transmission in Thailand.

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  • 1Department of Biology, Faculty of Science, Mahidol University, Bangkok, Thailand.


The bionomics of Anopheles minimus, one of the main malaria vectors in Thailand, were conducted in Pakchong district, Nakhon Ratchasima province, from January 1984 to June 1985. The prevalence of An. minimus was influenced by monthly rainfall, relative humidity, temperature and wind velocity, with a major peak of density from September to November. An. minimus preferred to feed on animal rather than on human, tended to bite human more outdoors than indoors, and thus exhibiting zoophilic and exophilic behaviour. The biting activity of the mosquitoes on animal exhibited high densities throughout the night in all seasons, whereas on human they tended to be an early evening biter in the dry cool season, and early morning biter in the wet season, and thus increasing the chance of man-vector contact. The life expectancy of An. minimus varied from month to month, ranging from 2.7 to 11.5 days, with the longest longevity during the dry cool season. The natural malaria infection rate of this species was very low. Out of 1,518 dissected guts, only 0.4% were found infected with oocysts. There were no sporozoites detected in the 1,560 dissected salivary glands.

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