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A Microsatellite-Based Analysis of House Infestation With Triatoma Infestans (Hemiptera: Reduviidae) After Insecticide Spraying in the Argentine Chaco.
Piccinali, Romina V; Gaunt, Michael W; Gürtler, Ricardo E.
Afiliación
  • Piccinali RV; Facultad de Ciencias Exactas y Naturales, Departamento de Ecología, Genética y Evolución, Laboratorio de Eco-Epidemiología Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
  • Gaunt MW; Instituto de Ecología, Genética y Evolución de Buenos Aires (IEGEBA), CONICET-Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
  • Gürtler RE; Infectious and Tropical Diseases Department, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, UK.
J Med Entomol ; 55(3): 609-619, 2018 05 04.
Article en En | MEDLINE | ID: mdl-29385501
Prevention of vector-borne transmission of Chagas disease mainly relies on residual insecticide spraying. Despite significant success at a regional scale, house infestation with Triatoma infestans (Klug) (Hemiptera: Reduviidae) still persists in the Gran Chaco ecoregion. One key aspect is the identification of the sources of reinfestant triatomines. After detecting fine-scale genetic structure in two rural villages of Pampa del Indio, Argentine Chaco, we tested hypotheses on the putative origins of the triatomines collected at 4, 8, and 12 mo after insecticide house spraying. We genotyped 10 microsatellite loci in 262 baseline and 83 postspraying triatomines from different houses. Genetic variability was similar between baseline and postspraying populations, but 13 low-frequency alleles were not detected at postspraying. FSTs were not significant between insects collected before and after insecticide spraying at the same house in all but one case, and they clustered together in a neighbor-joining tree. A clustering algorithm detected seven genetic groups, four of them mainly composed of baseline and postspraying insects from the same house. Assignment tests suggested multiple putative sources (including the house of collection) for most postspraying insects but excluded a house located more than 9 km from the study area. The origin of three triatomines was attributed to immigration from other unaccounted sources. Our study is compatible with the hypothesis that house reinfestations in the Argentine Chaco are mostly related to residual foci (i.e., survival of insects within the same community), in agreement with field observations, spatial analysis, and morphometric studies previously published.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Triatoma / Control de Insectos / Repeticiones de Microsatélite / Distribución Animal Límite: Animals País/Región como asunto: America do sul / Argentina Idioma: En Revista: J Med Entomol Año: 2018 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Triatoma / Control de Insectos / Repeticiones de Microsatélite / Distribución Animal Límite: Animals País/Región como asunto: America do sul / Argentina Idioma: En Revista: J Med Entomol Año: 2018 Tipo del documento: Article País de afiliación: Argentina Pais de publicación: Reino Unido