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El uso de Sistemas de Información Geografica y Sensores Remotos (SR) en Salud Pública Bogotá, Colombia, 27 al 30 de Marzo de 2006 Determinants of the effectiveness of chemical control for triatomine vectors in Venezuela: results from a trial Maria J. Sanchez-Martin 1 , M Dora Feliciangeli 2 and Clive R Davies 1 1. Department of infectious & tropical diseases, London School of Hygiene & Tropical Medicine, Kepple Street, London WC1E 7HT 2. Facultad de Ciencias de la Salud, BIOMED, Universidad de Carabobo, Maracay, Venezuela. Spraying with residual insecticides for vector control remains the principal component of Chagas disease control. Despite the undeniable overall success of vector control campaigns in reducing domestic infestation with triatomines in many countries (including during early stages of the Venezuelan programme), resurgence of triatomine populations at varying time points after spraying has been documented and constitutes one of the greatest potential technical limitations of control programmes. Given the apparent limited success [1] of the Venezuelan house spraying control programme to progress towards its recent targets (house infestation index with Rhodnius prolixus
El uso de Sistemas de Información Geografica y Sensores Remotos (SR) en Salud Pública Bogotá, Colombia, 27 al 30 de Marzo de 2006 the need to provide (for the first time) an accurate measure of triatomine resurgence in houses after they have been sprayed by standard Ministry of Health procedures (fenitrothion). The second issue was to determine whether these rates could be improved by switching to deltamethrin (used in the rest of Latin America), both by comparing resurgence rates and by comparing persistence of residual lethal effect. And thirdly, the study was designed to determine which sources (from residual surviving populations, re-infestation by bugs from other houses/outbuildings or re- infestation from sylvatic populations) were responsible for resurgence of domestic triatomine populations. A vector control trial was carried out in Barinas state involving 18 villages (526 houses and 854 peridomestic outbuildings). All houses (active search with tetramethrin and householders collections) and outbuildings (only active search with tetramethrin) were inspected for the presence of triatomines at baseline. Villages were divided into 2 groups: 9 villages were sprayed with fenitrothion (2gr/m2) and 9 with deltamethrin (0.025gr/m2) by fully trained Ministry of health personnel. All houses and peridomestic outbuildings were inspected again after 12 months post- spraying. Information on potential risk factors for infestation with triatomines was recorded. Wall bioassays to measure the lethal residual effect of fenitrothion and deltamethrin were performed on indoor house surfaces (wood and cement) after 24 hours, 1 month, 3 months and 6 months post-spraying. All triatomines collected were initially classified morphologically into species. Multivariate logistic regression and negative binomial regressions were used to test for association between household infestation/colonization and density of triatomines 12 months post-spraying, respectively, and household risk factors. A high percentage of houses (for R. prolixus: 32% after fenitrothion spraying and 19% after deltamethrin; for Triatoma maculata: 14.3% after fenitrothion and 40% after deltamethrin) and peri-domestic outbuildings (for R. prolixus: 16.6 % after fenitrothion and 11.1% after deltamethrin; for T. maculata: 40.4% after fenitrothion and 52% after deltamethrin) remained positive 1 year post-spraying. 163
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Universidad de los Andes Centro de
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El uso de Sistemas de Información
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PROLOGO El uso de Sistemas de Infor
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Summary El uso de Sistemas de Infor
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References El uso de Sistemas de In
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Tabla 5. Clasificación de los punt
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Bibliografia El uso de Sistemas de
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