Changes in malaria vector densities over a twenty-three year period in Mae Hong Son Province, northern Thailand.

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dc.contributor.authorSuwonkerd, Wannapaen_US
dc.contributor.authorTsuda, Yoshioen_US
dc.contributor.authorOvergaard, Hans Jen_US
dc.contributor.authorChawprom, Srisuchaen_US
dc.contributor.authorTuno, Nobukoen_US
dc.contributor.authorPrajakwong, Somsaken_US
dc.contributor.authorTakagi, Masahiroen_US
dc.date.accessioned2009-05-27T14:52:01Z
dc.date.available2009-05-27T14:52:01Z
dc.date.issued2004-06-05en_US
dc.descriptionThe Southeast Asian Journal of Tropical Medicine and Public Health.en_US
dc.description.abstractMae Hong Son Province in northwestern Thailand has a long history of malaria. During the last two decades the province has had one of the highest malaria incidences of all provinces in Thailand. Data were analyzed to determine whether the vector populations were stable or increasing during the last two decades and to determine the seasonal prevalence of the main vectors, and whether or not they were related to the malaria transmission peak, in the wet season. We compiled and analyzed accumulated entomological records from 1977 to 1999. The aim was to investigate long-term changes in mean densities of malaria vectors between two periods (1977-1989 and 1990-1999), and the differences in vector densities between two seasons (wet and dry). A total of 141,144 adult anophelines of 29 species were collected on indoor and outdoor human baits and animal baits during the study period. Of the main malaria vectors, the densities of Anopheles minimus s.l. and Anopheles maculatus complex increased significantly. Anopheles dirus s.l., however, was stable between the two periods. These vector populations were associated with consistently high malaria incidence in the province during the last two decades. An. minimus s.l. density was not significantly different between seasons. However, in the second period, both An. dirus s.l. and An. maculatus complex showed a tendency for higher wet season densities. This can explain the high malaria incidence in the rainy season in Mae Hong Son. Environmental and climatic factors seem to have been favorable for supporting a consistently high vector population in the province, and consequently a high malaria transmission rate during the period of study.en_US
dc.description.affiliationOffice of Disease Prevention and Control No. 10, Department of Diseases Control, Ministry of Public Health, Chiang Mai, Thailand. malar@chmai.loxinfo.co.then_US
dc.identifier.citationSuwonkerd W, Tsuda Y, Overgaard HJ, Chawprom S, Tuno N, Prajakwong S, Takagi M. Changes in malaria vector densities over a twenty-three year period in Mae Hong Son Province, northern Thailand. The Southeast Asian Journal of Tropical Medicine and Public Health. 2004 Jun; 35(2): 316-24en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/31297
dc.language.isoengen_US
dc.source.urihttps://www.tm.mahidol.ac.th/seameo/2004_35_2/14-3221.pdfen_US
dc.subject.meshAnimalsen_US
dc.subject.meshAnopheles --classificationen_US
dc.subject.meshHumansen_US
dc.subject.meshIncidenceen_US
dc.subject.meshInsect Vectors --parasitologyen_US
dc.subject.meshMalaria, Falciparum --epidemiologyen_US
dc.subject.meshPlasmodium falciparum --isolation & purificationen_US
dc.subject.meshPopulation Densityen_US
dc.subject.meshSeasonsen_US
dc.subject.meshSpecies Specificityen_US
dc.subject.meshThailand --epidemiologyen_US
dc.subject.meshTime Factorsen_US
dc.titleChanges in malaria vector densities over a twenty-three year period in Mae Hong Son Province, northern Thailand.en_US
dc.typeComparative Studyen_US
dc.typeJournal Articleen_US
dc.typeResearch Support, Non-U.S. Gov'ten_US
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