Inferring from the Cyt B Gene the Triatoma brasiliensis Neiva, 1911 (Hemiptera: Reduviidae: Triatominae) Genetic Structure and Domiciliary Infestation in the State of Paraíba, Brazil

Carlos Eduardo Almeida Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil; Universidade Federal do Rio Grande do Sul, Departamento de Genética, Porto Alegre, RS, Brazil; Institut de Recherche pour le Développement, UR072 en la Pontificia Universidad Católica del Ecuador, Laboratorio de Entomología, Quito, Ecuador; Division of Parasitic Diseases, Centers for Disease Control and Prevention, NCID, Chamblee, Georgia

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Raquel S. Pacheco Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil; Universidade Federal do Rio Grande do Sul, Departamento de Genética, Porto Alegre, RS, Brazil; Institut de Recherche pour le Développement, UR072 en la Pontificia Universidad Católica del Ecuador, Laboratorio de Entomología, Quito, Ecuador; Division of Parasitic Diseases, Centers for Disease Control and Prevention, NCID, Chamblee, Georgia

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Karen Haag Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil; Universidade Federal do Rio Grande do Sul, Departamento de Genética, Porto Alegre, RS, Brazil; Institut de Recherche pour le Développement, UR072 en la Pontificia Universidad Católica del Ecuador, Laboratorio de Entomología, Quito, Ecuador; Division of Parasitic Diseases, Centers for Disease Control and Prevention, NCID, Chamblee, Georgia

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Stéphane Dupas Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil; Universidade Federal do Rio Grande do Sul, Departamento de Genética, Porto Alegre, RS, Brazil; Institut de Recherche pour le Développement, UR072 en la Pontificia Universidad Católica del Ecuador, Laboratorio de Entomología, Quito, Ecuador; Division of Parasitic Diseases, Centers for Disease Control and Prevention, NCID, Chamblee, Georgia

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Ellen M. Dotson Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil; Universidade Federal do Rio Grande do Sul, Departamento de Genética, Porto Alegre, RS, Brazil; Institut de Recherche pour le Développement, UR072 en la Pontificia Universidad Católica del Ecuador, Laboratorio de Entomología, Quito, Ecuador; Division of Parasitic Diseases, Centers for Disease Control and Prevention, NCID, Chamblee, Georgia

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Jane Costa Instituto Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil; Universidade Federal do Rio Grande do Sul, Departamento de Genética, Porto Alegre, RS, Brazil; Institut de Recherche pour le Développement, UR072 en la Pontificia Universidad Católica del Ecuador, Laboratorio de Entomología, Quito, Ecuador; Division of Parasitic Diseases, Centers for Disease Control and Prevention, NCID, Chamblee, Georgia

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The Triatoma brasiliensis genetic structure was analyzed using the Cyt B gene in different geographic locations and ecotopes after a short and long period after insecticide treatment. Four different localities (16–40 km apart) in the state of Paraíba, Brazil, were sampled. Analysis of molecular variance (AMOVA) showed that grouping populations according to the geographic location or ecotope resulted in a higher variance among populations within groups (ΦSC ranging from 0.15 to 0.17) than among groups (ΦCT ranging from 0.04 to 0.07). The percentage of variation was reduced among populations within groups and increased among groups (ΦSC = 0.08, ΦCT = 0.16) by grouping 1) the domiciliary populations from each village and 2) all wild populations. These data indicated that T. brasiliensis is genetically structured both ecologically and at a smaller geographic scale for domiciliary populations. Re-infestations after insecticide treatment were composed of distinct populations, pointing to variable population sources for domiciliary infestations.

Author Notes

Reprint requests: Carlos Eduardo Almeida, Instituto Oswaldo Cruz, Fiocruz, Pav. Mourisco, s/211, Av. Brasil 4365, 21045-900 Rio de Janeiro, RJ, Brazil.
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