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Background: Prevention of Chagas disease depends mainly on control of the insect vectors that transmit infection. Unfortunately, the vectors have been resurgent in some areas. It is important to understand the dynamics of reinfestation where it occurs. Here we show how continuous- and discrete-time models fitted to patch-level infestation states can elucidate different aspects of re-establishment. Triatoma infestans, the main vector of Chagas disease, reinfested sites in three villages in northwest Argentina after community-wide insecticide spraying in October 1992. Methodology/Principal Findings:Different methods of estimating the probabilities of bug establishment on each site were compared. The results confirmed previous results showing a 6-month time lag between detection of a new infestation and dispersal events. The analysis showed that more new bug populations become established from May to November than from November to May. This seasonal increase in bug establishment coincides with a seasonal increase in dispersal distance. In the fitted models, the probability of new bug establishment increases with increasing time since last detected infestation. Conclusions/Significance: These effects of season and previous infestation on bug establishment challenge our current understanding of T. infestans ecology and highlight important gaps in knowledge. Experiments necessary to close these gaps are discussed. © 2009 zu Dohna et al.


Documento: Artículo
Título:Spatial re-establishment dynamics of local populations of vectors of Chagas disease
Autor:Zu Dohna, H.; Cecere, M.C.; Gürtler, R.E.; Kitron, U.; Cohen, J.E.
Filiación:Center for Animal Disease Modelling, Department of Veterinary Medicine, University of California Davis, Davis, CA, United States
Department of Ecology, Genetics and Evolution, University of Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
Department of Environmental Studies, Emory University, Atlanta, GA, United States
Laboratory of Populations, Rockefeller University, Columbia University, New York, NY, United States
Palabras clave:insecticide; Argentina; article; Chagas disease; controlled study; intermethod comparison; nonhuman; population dispersal; population dynamics; probability; seasonal variation; Triatoma infestans; vector control; animal; Argentina; Chagas disease; disease carrier; disease transmission; drug effect; ecology; ecosystem; growth, development and aging; human; insect control; methodology; season; time; Triatoma; Animals; Argentina; Chagas Disease; Disease Vectors; Ecology; Ecosystem; Humans; Insect Control; Seasons; Time Factors; Triatoma
Título revista:PLoS Neglected Tropical Diseases
Título revista abreviado:PLoS. Negl. Trop. Dis.


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---------- APA ----------
Zu Dohna, H., Cecere, M.C., Gürtler, R.E., Kitron, U. & Cohen, J.E. (2009) . Spatial re-establishment dynamics of local populations of vectors of Chagas disease. PLoS Neglected Tropical Diseases, 3(7).
---------- CHICAGO ----------
Zu Dohna, H., Cecere, M.C., Gürtler, R.E., Kitron, U., Cohen, J.E. "Spatial re-establishment dynamics of local populations of vectors of Chagas disease" . PLoS Neglected Tropical Diseases 3, no. 7 (2009).
---------- MLA ----------
Zu Dohna, H., Cecere, M.C., Gürtler, R.E., Kitron, U., Cohen, J.E. "Spatial re-establishment dynamics of local populations of vectors of Chagas disease" . PLoS Neglected Tropical Diseases, vol. 3, no. 7, 2009.
---------- VANCOUVER ----------
Zu Dohna, H., Cecere, M.C., Gürtler, R.E., Kitron, U., Cohen, J.E. Spatial re-establishment dynamics of local populations of vectors of Chagas disease. PLoS. Negl. Trop. Dis. 2009;3(7).