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Risk factors for house-entry by culicine mosquitoes in a rural town and satellite villages in The Gambia

Kirby, MJ; West, P; Green, C; Jasseh, M; Lindsay, SW; (2008) Risk factors for house-entry by culicine mosquitoes in a rural town and satellite villages in The Gambia. Parasites & Vectors , 1 , Article 41. 10.1186/1756-3305-1-41. Green open access

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Abstract

Background: Screening doors, windows and eaves of houses should reduce house entry by eusynanthropic insects, including the common African house mosquito Culex pipiens quinquefasciatus and other culicines. In the pre-intervention year of a randomized controlled trial investigating the protective effects of house screening against mosquito house entry, a multi-factorial risk factor analysis study was used to identify factors influencing house entry by culicines of nuisance biting and medical importance. These factors were house location, architecture, human occupancy and their mosquito control activities, and the number and type of domestic animals within the compound.Results: 40,407 culicines were caught; the dominant species were Culex thalassius, Cx. pipiens s.l., Mansonia africanus, M. uniformis and Aedes aegypti. There were four times more Cx. pipiens s.l. in Farafenni town (geometric mean/trap/night = 8.1, 95% confidence intervals, CIs = 7.2-9.1) than in surrounding villages (2.1, 1.9-2.3), but over five times more other culicines in the villages (25.1, 22.1-28.7) than in town (4.6, 4.2-5.2). The presence of Cx. pipiens s.l. was reduced in both settings if the house had closed eaves (odds ratios, OR town = 0.62, 95% CIs = 0.49-0.77; OR village = 0.49, 0.33-0.73), but increased per additional person in the trapping room (OR town = 1.16, 1.09-1.24; OR village = 1.10, 1.02-1.18). In the town only, Cx. pipiens s.l. numbers were reduced if houses had a thatched roof (OR = 0.70, 0.51-0.96), for each additional cow tethered near the house (OR = 0.73, 0.65-0.82) and with increasing distance from a pit latrine (OR = 0.97, 0.95-0.99). In the villages a reduction in Cx. pipiens s.l. numbers correlated with increased horses in the compound (OR = 0.90, 0.82-0.99). The presence of all other culicines was reduced in houses with closed eaves (both locations), with horses tethered outside (village only) and with increasing room height (town only), but increased with additional people in the trapping room and where cows were tethered outside (both locations).Conclusion: The findings of this study advocate eave closure and pit latrine treatment in all locations, and zooprophylaxis using horses in rural areas, as simple control measures that could reduce the number of culicines found indoors.

Type: Article
Title: Risk factors for house-entry by culicine mosquitoes in a rural town and satellite villages in The Gambia
Open access status: An open access version is available from UCL Discovery
DOI: 10.1186/1756-3305-1-41
Publisher version: http://dx.doi.org/10.1186/1756-3305-1-41
Language: English
Additional information: © 2008 Kirby et al; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Aegypti l diptera, culex-quinquefasciatus, west-africa, aedes-aegypti, malaria transmission, south-india, behavior, vectors, tanzania, area
UCL classification: UCL
URI: https://discovery.ucl.ac.uk/id/eprint/140926
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