Seasonal and Spatial Dynamics of the Primary Vector of Plasmodium knowlesi within a Major Transmission Focus in Sabah, Malaysia

Wong, M.L. and Chua, T.H. and Leong, C.S. and Khaw, L.T. and Fornace, K. and Wan Sulaiman, W.Y. and William, T. and Drakeley, C. and Ferguson, H.M. and Vythilingam, I. (2015) Seasonal and Spatial Dynamics of the Primary Vector of Plasmodium knowlesi within a Major Transmission Focus in Sabah, Malaysia. PLoS Neglected Tropical Diseases, 9 (10). e0004135. ISSN 1935-2735, DOI https://doi.org/10.1371/journal.pntd.0004135.

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Official URL: http://dx.doi.org/10.1371/journal.pntd.0004135

Abstract

Background: The simian malaria parasite Plasmodium knowlesi is emerging as a public health problem in Southeast Asia, particularly in Malaysian Borneo where it now accounts for the greatest burden of malaria cases and deaths. Control is hindered by limited understanding of the ecology of potential vector species. Methodology/Principal Findings: We conducted a one year longitudinal study of P. knowlesi vectors in three sites within an endemic area of Sabah, Malaysia. All mosquitoes were captured using human landing catch. Anopheles mosquitoes were dissected to determine, oocyst, sporozoites and parous rate. Anopheles balabacensis is confirmed as the primary vector of. P. knowlesi (using nested PCR) in Sabah for the first time. Vector densities were significantly higher and more seasonally variable in the village than forest or small scale farming site. However An. balabacensis survival and P. knowlesi infection rates were highest in forest and small scale farm sites. Anopheles balabacensis mostly bites humans outdoors in the early evening between 1800 to 2000hrs. Conclusions/Significance: This study indicates transmission is unlikely to be prevented by bednets. This combined with its high vectorial capacity poses a threat to malaria elimination programmes within the region.

Item Type: Article
Funders: University of Malaya High Impact Research Grant UM.C/625/1/HIR/099 J-20011-73822, University of Malaya student Grant IPP 105-2014A, Environmental & Social Ecology of Human Infectious Diseases Initiative (ESEI), MRC Grant Number: G1100796
Uncontrolled Keywords: Animals; Anopheles; Feeding Behavior; Female; Forests; Insect Vectors; Longitudinal Studies; Malaysia; Male; Plasmodium knowlesi; Population Density; Seasons; Spatio-Temporal Analysis
Subjects: R Medicine
Divisions: Faculty of Medicine
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 28 Sep 2018 03:58
Last Modified: 28 Sep 2018 03:58
URI: http://eprints.um.edu.my/id/eprint/19450

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