Key Source Habitats and Potential Dispersal of Triatoma infestans Populations in Northwestern Argentina: Implications for Vector ControlReportar como inadecuado

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Journal Title:

PLoS Neglected Tropical Diseases


Volume 8, Number 10


Public Library of Science | 2014-10-09, Pages e3238-e3238

Type of Work:

Article | Final Publisher PDF

Abstract: Background: Triatoma infestans —the principal vector of the infection that causes Chagas disease— defies elimination efforts in the Gran Chaco region. This study identifies the types of human-made or -used structures that are key sources of these bugs in the initial stages of house reinfestation after an insecticide spraying campaign. Methodology and Principal Findings: We measured demographic and blood-feeding parameters at two geographic scales in 11 rural communities in Figueroa, northwest Argentina. Of 1,297 sites searched in spring, 279 21.5% were infested. Bug abundance per site and female fecundity differed significantly among habitat types ecotopes and were highly aggregated. Domiciles human sleeping quarters had maximum infestation prevalence 38.7%, human-feeding bugs and total egg production, with submaximal values for other demographic and blood-feeding attributes. Taken collectively peridomestic sites were three times more often infested than domiciles. Chicken coops had greater bug abundance, blood-feeding rates, engorgement status, and female fecundity than pig and goat corrals. The host-feeding patterns were spatially structured yet there was strong evidence of active dispersal of late-stage bugs between ecotopes. Two flight indices predicted that female fliers were more likely to originate from kitchens and domiciles, rejecting our initial hypothesis that goat and pig corrals would dominate. Conclusions and Significance: Chicken coops and domiciles were key source habitats fueling rapid house reinfestation. Focusing control efforts on ecotopes with human-fed bugs domiciles, storerooms, goat corrals would neither eliminate the substantial contributions to bug population growth from kitchens, chicken coops, and pig corrals nor stop dispersal of adult female bugs from kitchens. Rather, comprehensive control of the linked network of ecotopes is required to prevent feeding on humans, bug population growth, and bug dispersal simultaneously. Our study illustrates a demographic approach that may be applied to other regions and triatomine species for the design of innovative, improved vector control strategies.

Subjects: Environmental Sciences - Health Sciences, Epidemiology - Research Funding: This study was supported by awards from the National Institutes of Health-National Science Foundation Ecology of Infectious Disease program award R01TW05836 funded by the Fogarty International Center and the National Institute of Environmental Health Sciences to UK, REG and JEC, Agencia Nacional de Promoción Científica y Tecnológica PICT and PICTO-Glaxo, and the University of Buenos Aires to REG.

REG and MCC are members of CONICET Researcher's Career.

JEC acknowledges with thanks the support of U.S. National Science Foundation grants EF-1038337 and DMS-1225529.

Keywords: Animals - Argentina - Chagas Disease - Chickens - Demography - Ecosystem - Feeding Behavior - Female - Goats - Humans - Insect Control - Insecticides - Residence Characteristics - Rural Population - Seasons - Swine - Triatoma - Fecundity - Infectious disease control - Triatoma - Insect flight - Flight biology -

Autor: Ricardo E. Gürtler, María C. Cecere, María del Pilar Fernández, Gonzalo Vazquez Prokopec, Leonardo A. Ceballos, Juan M. Gurev



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