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3 October 2023 Does prior exposure to larvicides influence dengue virus susceptibility in Aedes aegypti (Diptera: Culicidae)?
Robert L. Aldridge, Barry W. Alto, C. Roxanne Connelly, Bernard Okech, Blair Siegfried, Bradley H. Eastmond, Abdullah A. Alomar, Kenneth J. Linthicum
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Abstract

Control of mosquito vector populations is primarily intended to reduce the transmission of pathogens they transmit. Use of chemical controls, such as larvicides, can have unforeseen consequences on adult traits if not applied properly. The consequences of under application of larvicides are little studied, specifically the impacts on pathogen infection and transmission by the vectors that survive exposure to larvicides. We compared vector susceptibility of Aedes aegypti (L.) for dengue virus, serotype 1 (DENV-1) previously exposed as larvae to an LC50 of different classes of insecticides as formulated larvicides. Larval exposure to insect growth regulators (methoprene and pyriproxyfen) significantly increased susceptibility to infection of DENV-1 in Ae. aegypti adults but did not alter disseminated infection or transmission. Larval exposure to temephos, spinosad, and Bti did not increase infection, disseminated infection, or transmission of DENV-1. Our findings describe a previously under observed phenomenon, the latent effects of select larvicides on mosquito vector susceptibility for arboviruses. These data suggest that there are unintended consequences of sublethal exposure to select larvicides that can influence susceptibility of Ae. aegypti to DENV infection, and indicates the need for further investigation of sublethal effects of insecticides on other aspects of mosquito biology, especially those parameters relevant to a mosquitoes ability to transmit arboviruses (life span, biting behavior, extrinsic incubation period).

Robert L. Aldridge, Barry W. Alto, C. Roxanne Connelly, Bernard Okech, Blair Siegfried, Bradley H. Eastmond, Abdullah A. Alomar, and Kenneth J. Linthicum "Does prior exposure to larvicides influence dengue virus susceptibility in Aedes aegypti (Diptera: Culicidae)?," Journal of Medical Entomology 61(1), 166-174, (3 October 2023). https://doi.org/10.1093/jme/tjad137
Received: 12 May 2023; Accepted: 27 September 2023; Published: 3 October 2023
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KEYWORDS
Bacillus thuringiensis israelensis
methoprene
pyriproxyfen
spinosad
temephos
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