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1 July 2011 Secondary Kill Effect of Deltamethrin on Triatoma infestans
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Abstract

Control of the Chagas disease vector, Triatoma infestans, relies on the application of pyrethroid insecticides, especially deltamethrin. We performed laboratory studies to determine whether a T. infestans nymph that comes into contact with a deltamethrin-treated surface horizontally transfers the insecticide to subsequent triatomines. We found that a triatomine that walks on a deltamethrin-treated surface for a short period of time has the ability to transport the insecticide in concentrations sufficient to kill other triatomines with which it comes into contact. The effect was limited to high-density environments, and mortality as a result of secondary exposure was greater among second-instar nymphs compared with fifth-instar nymphs. Our results suggest that deltamethrin could be killing triatomines through both direct and indirect contact, although it remains unclear whether the phenomenon occurs in natural conditions.

© 2011 Entomological Society of America
Kathleen M. Maloney, Jenny Ancca-Juarez, Renzo Salazar, Katty Borrini-Mayori, Danitza Pamo-Tito, Joseph A. Keating, and Michael Z. Levy "Secondary Kill Effect of Deltamethrin on Triatoma infestans," Journal of Medical Entomology 48(4), (1 July 2011). https://doi.org/10.1603/ME10268
Received: 7 December 2010; Accepted: 1 March 2011; Published: 1 July 2011
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