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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 Incrimination of triatomine vectors in Colombia. D.H. Campbell-Lendrum, N. Pinto, G. Aguilera, F. Guhl, L. Esteban, V. M. Angulo, G.J. Parra, M. Restrepo, C.R. Davies. Information on the relative importance of different vector species is an important guide to control programmes, as it may allow targeting of control interventions to areas with more efficient vectors. Evidence on comparative importance of different vectors can come from detailed laboratory and field experiments of host- preference, feeding and defecation frequency and competence for completing the parasite life cycle inside the vector (e.g. Christensen et al., 1988; Crocco and Catala, 1997; Crocco and Catala, 1996; Gurtler et al., 1997; Minter et al., 1978). Such studies suggest that R. prolixus is the most efficient vector in the Andean and Central American regions. However, such studies do not provide a direct measure of how these various effects combine to determine the overall efficiency of different vectors, under field situations. Here, we applying a technique that has been applied to estimate the ‘aggregate’ vectorial efficiency of vectors for other diseases (e.g. Davies et al., 1997)). We regress the infestation prevalence of various triatomine species against the 62
El uso de Sistemas de Información Geografica y Sensores Remotos (SR) en Salud Pública Bogotá, Colombia, 27 al 30 de Marzo de 2006 prevalence of human infections in the same villages in Colombia. This provides a quantitative comparison of the relative importance of the most common vector species in the region. The partial overlap between surveys allowed the serological results from approximately 9,808 children to be linked to infestation prevalence at the village level. Logistic regression was used to test the association between the probability of each child being infected, and the proportion of houses in their village which had sent pots with at least one triatomine of each species (R. prolixus, T. dimidiata. Tests were carried out both univariately for each species, and multivariately (i.e. estimates for the effect of each species control for the effect of all other species). In all analyses, odds ratios were adjusted for the effect of age and sex of the child, and for clustering at the village level. Both univariate and multivariate analysis show a significant, and very large, positive association between higher proportions of houses infested with R. prolixus and higher probabilities of children being infected (Multivariate analysis Odds ratios for infection in villages with 1-40% infestation 3.17 (95% CI 1.56-6.46), and for 41- 100% infestation 6.25 (2.07 – 18.91). There is little evidence for an association with other vector species, and there is a suggestion of a negative effect of some vector species. The strong correlation with R. prolixus is expected, but the data presented here add a direct epidemiological measurement of their importance. None of the other species is usually considered as efficient a vector as R. prolixus, mainly because they tend to be more abundant in the peridomestic rather than domestic environment. It is surprising, however, to find no consistent evidence that infection rates increase with higher levels of infestation of any of the other species. The results should be treated with caution, both because the sample sizes for these other species are smaller than for R. prolixus, and because these results appear to contradict evidence for the vectorial importance of some other species (notably T. dimidiata) in other locations. This should be further explored by detailed analysis of these data, and potentially new studies in areas with single species and with mixed 63
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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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Page 31 and 32: Summary El uso de Sistemas de Infor
Page 33 and 34: References El uso de Sistemas de In
Page 45 and 46: Tabla 5. Clasificación de los punt
Page 53 and 54: Bibliografia El uso de Sistemas de
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Page 77 and 78: Infes tacion CGN+Ba + Cc+A4 CGN El
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HABITAT DE COLECTA El uso de Sistem
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1. ANEXOS No. MUNICIPIO AÑOS VERED
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Rhodnius prolixus Panstrongylus gen
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1. Esquema de la presentación El u
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Demand of healthcare for Chronic Ch
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Regional Hospital of Soata Departme
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APENDICE 3: Participantes en el pan
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Bogotá, Colombia, 27 al 30 de Marz
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Bibliografía Bogotá, Colombia, 27
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