Ecohealth Interventions Limit Triatomine Reinfestation following Insecticide Spraying in La Brea, Guatemala

David E. Lucero University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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Leslie A. Morrissey University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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Donna M. Rizzo University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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Antonieta Rodas University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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Roberto Garnica University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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Lori Stevens University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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Dulce M. Bustamante University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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Maria Carlota Monroy University of Vermont, Burlington, Vermont; Universidad de San Carlos, Ciudad de Guatemala, Guatemala

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In this study, we evaluate the effect of participatory Ecohealth interventions on domestic reinfestation of the Chagas disease vector Triatoma dimidiata after village-wide suppression of the vector population using a residual insecticide. The study was conducted in the rural community of La Brea, Guatemala between 2002 and 2009 where vector infestation was analyzed within a spatial data framework based on entomological and socio-economic surveys of homesteads within the village. Participatory interventions focused on community awareness and low-cost home improvements using local materials to limit areas of refuge and alternative blood meals for the vector within the home, and potential shelter for the vector outside the home. As a result, domestic infestation was maintained at ≤ 3% and peridomestic infestation at ≤ 2% for 5 years beyond the last insecticide spraying, in sharp contrast to the rapid reinfestation experienced in earlier insecticide only interventions.

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Author Notes

* Address correspondence to David E. Lucero, 109 Carrigan Drive, Burlington, VT 05401. E-mail: dlucero@uvm.edu

Financial support: This research was funded by WHO TDR (2001–2002), IDRC (2004–2009) and NETROPICA (2008–2009), and by the National Institutes of Health (USA) Grant 1R15 A1079672-01A1.

Authors' addresses: David E. Lucero, Leslie A. Morrissey, Donna M. Rizzo, and Lori Stevens, University of Vermont, Burlington, VT, E-mails: david.lucero@uvm.edu, leslie.morrissey@uvm.edu, drizzo@cems.uvm.edu, and lori.stevens@uvm.edu. Antonieta Rodas, Roberto Garnica, Dulce M. Bustamante, and Maria Carlota Monroy, Universidad de San Carlos, Ciudad de Guatemala, Guatemala, E-mails: antonieta55@yahoo.com, rogarnika@hotmail.com, dulce_mariab@hotmail.com, and mcarlotamonroy@gmail.com.

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