Residual Infestation and Recolonization during Urban Triatoma infestans Bug Control Campaign,Peru |
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Authors: | Corentin M Barbu Alison M Buttenheim Maria-Luz Hancco Pumahuanca Javier E Quintanilla Calderón Renzo Salazar Malwina Carrión Andy Catacora Rospigliossi Fernando S Malaga Chavez Karina Oppe Alvarez Juan Cornejo del Carpio César Náquira Michael Z Levy |
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Institution: | University of Pennsylvania, Philadelphia, Pennsylvania, USA (C.M. Barbu, A.M. Buttenheim, M.Z. Levy); ;Universidad Peruana Cayetano Heredia, Arequipa, Peru (M.-L. Hancco Pumahuanca, J.E. Quintanilla Calderón, R. Salazar, M. Carrión, C. Náquira); ;Red de Salud Aequipa Caylloma, Arequipa (A. Catacora Rospigliossi); ;Dirección Regional del Ministerio de Salud, Arequipa (F.S. Malaga Chavez, K. Oppe Alvarez, J. Cornejo del Carpio) |
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Abstract: | Chagas disease vector control campaigns are being conducted in Latin America, but little is known about medium-term or long-term effectiveness of these efforts, especially in urban areas. After analyzing entomologic data for 56,491 households during the treatment phase of a Triatoma infestans bug control campaign in Arequipa, Peru, during 2003–2011, we estimated that 97.1% of residual infestations are attributable to untreated households. Multivariate models for the surveillance phase of the campaign obtained during 2009–2012 confirm that nonparticipation in the initial treatment phase is a major risk factor (odds ratio OR] 21.5, 95% CI 3.35–138). Infestation during surveillance also increased over time (OR 1.55, 95% CI 1.15–2.09 per year). In addition, we observed a negative interaction between nonparticipation and time (OR 0.73, 95% CI 0.53–0.99), suggesting that recolonization by vectors progressively dilutes risk associated with nonparticipation. Although the treatment phase was effective, recolonization in untreated households threatens the long-term success of vector control. |
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Keywords: | Chagas disease Trypanosoma cruzi Triatoma infestans bugs vector infestation recolonization urban vector control campaign Peru |
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