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    Mosquito Behavior Change After Distribution of Bednets Results in Decreased Protection Against Malaria Exposure

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    Author
    Thomsen, EK; Koimbu, G; Pulford, J; Jamea-Maiasa, S; Ura, Y; Keven, JB; Siba, PM; Mueller, I; Hetzel, MW; Reimer, LJ
    Date
    2017-03-01
    Source Title
    Journal of Infectious Diseases
    Publisher
    OXFORD UNIV PRESS INC
    University of Melbourne Author/s
    Mueller, Ivo
    Affiliation
    Medical Biology (W.E.H.I.)
    Metadata
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    Document Type
    Journal Article
    Citations
    Thomsen, E. K., Koimbu, G., Pulford, J., Jamea-Maiasa, S., Ura, Y., Keven, J. B., Siba, P. M., Mueller, I., Hetzel, M. W. & Reimer, L. J. (2017). Mosquito Behavior Change After Distribution of Bednets Results in Decreased Protection Against Malaria Exposure. JOURNAL OF INFECTIOUS DISEASES, 215 (5), pp.790-797. https://doi.org/10.1093/infdis/jiw615.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/255755
    DOI
    10.1093/infdis/jiw615
    Abstract
    Background: Behavioral resilience in mosquitoes poses a significant challenge to mosquito control. Although behavior changes in anopheline vectors have been reported over the last decade, there are no empirical data to suggest they compromise the efficacy of vector control in reducing malaria transmission. Methods: In this study, we quantified human exposure to both bites and infective bites of a major malaria vector in Papua New Guinea over the course of 4 years surrounding nationwide bednet distribution. We also quantified malaria infection prevalence in the human population during the same time period. Results: We observed a shift in mosquito biting to earlier hours of the evening, before individuals are indoors and protected by bednets, followed by a return to preintervention biting rates. As a result, net users and non-net users experienced higher levels of transmission than before the intervention. The personal protection provided by a bednet decreased over the study period and was lowest in the adult population, who may be an important reservoir for transmission. Malaria prevalence decreased in only 1 of 3 study villages after the distribution. Discussion: This study highlights the necessity of validating and deploying vector control measures targeting outdoor exposure to control and eliminate malaria.

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