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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 Presence of infestation at baseline, density of R. prolixus in outbuildings, availability of hiding refuges (such as palm roofs and hen nests) and distance to the nearest positive house, were major factors determining indoor infestation, colonization and density of R. prolixus post-spraying. For T. maculata the presence of this vector at baseline, the total number of hen nests indoors and the density of T. maculata in peridomestic-outbuildings were the most important risk factors for indoor infestation, colonization and density post spraying. In peridomestic outbuildings the presence of nests and the presence of infestation pre-spraying were the most important risk factors for the presence of triatomines post-spraying. Additionally the distance to neighbouring outbuildings and the presence of palm roofs in outbuildings were determinants of infestation colonization and density. Although there was a trend in effectiveness in favour of deltamethrin (as compared with fenitrothion), no significant effect of insecticide type was detected on infestation, colonization or density of R. prolixus in either houses or outbuildings one year after spraying. In contrast, fenitrothion was found to be significantly more effective than deltamethrin in reducing infestation, colonization and density of T. maculata both indoors and in outbuildings. The evidence provided by the trial appears to indicate that the effectiveness of house spraying in Venezuela is significantly compromised by the frequent inability to eliminate triatomines with a single spray round. Re-infestation of houses by triatomines that have survived spraying in nearby outbuildings is also a serious threat and there is also the possibility of re-invasion by R.prolixus from nearby houses where spraying has not been fully effective. It seems unlikely that re-invasion of houses by sylvatic R. prolixus bugs was the major cause of the infestations detected in either houses or outbuildings within the first year after spraying. The trial 164
El uso de Sistemas de Información Geografica y Sensores Remotos (SR) en Salud Pública Bogotá, Colombia, 27 al 30 de Marzo de 2006 found no clear evidence that switching from fenitrothion to deltamethrin would increase the effectiveness of the control programme against R. prolixus. However, the results indicated there could be some advantages to this switch, and there was certainly no suggestion that if the switch was made (e.g. on health safety grounds) that this would compromise the control programme’s chances of achieving its targets for R. prolixus elimination. The possible reasons for the poor effectiveness observed for deltamethrin on the secondary vector, T. maculata, requires further investigation. Reference 1. Feliciangeli, D., et al., Chagas disease control in Venezuela: lessons for the Andean region and beyond. Trends in Parasitology, 2003. 19(1): p. 44-49. 165
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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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Infes tacion CGN+Ba + Cc+A4 CGN El
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