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

Ricardo E. Gürtler; María C. Cecere; María del Pilar Fernández; Gonzalo M. Vazquez-Prokopec; Leonardo A. Ceballos; Juan M. Gurevitz; Uriel Kitron; Joel E. Cohen

Title:
Key Source Habitats and Potential Dispersal of Triatoma infestans Populations in Northwestern Argentina: Implications for Vector Control
Author(s):
Gürtler, Ricardo E.
Cecere, María C.
Fernández, María del Pilar
Vazquez-Prokopec, Gonzalo M.
Ceballos, Leonardo A.
Gurevitz, Juan M.
Kitron, Uriel
Cohen, Joel E.
Date:
Type:
Articles
Department(s):
Earth and Environmental Sciences
Volume:
8
Persistent URL:
Book/Journal Title:
PLoS Neglected Tropical Diseases
Geographic Area:
Argentina
Publisher:
Public Library of Science
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.
Subject(s):
Vector control
Communicable diseases--Control
Triatoma
Ecology
Epidemiology
Publisher DOI:
https://doi.org/10.1371/journal.pntd.0003238
Item views
317
Metadata:
text | xml
Suggested Citation:
Ricardo E. Gürtler, María C. Cecere, María del Pilar Fernández, Gonzalo M. Vazquez-Prokopec, Leonardo A. Ceballos, Juan M. Gurevitz, Uriel Kitron, Joel E. Cohen, , Key Source Habitats and Potential Dispersal of Triatoma infestans Populations in Northwestern Argentina: Implications for Vector Control, Columbia University Academic Commons, .

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