Abstract

SANCHEZ, Zunilda et al. Triatoma sordida: indicators of adaptive capacity and Trypanosoma cruzi in tradomicile transmission in the Paraguayan Chaco. Mem. Inst. Investig. Cienc. Salud [online]. 2016, vol.14, n.3, pp.96-101. ISSN 1812-9528.  https://doi.org/10.18004/mem.iics/1812-9528/2016.014(03)96-101.

The Gran Chaco is an eco-region that includes Argentina, Bolivia and Paraguay; where the vectorial transmission of Chagas disease by Triatoma infestans (main vector) is a public health problem up to date. The Paraguayan Chaco occupies 25% of this region, characterized by low population density and dispersed locations. The aim of this study was to determine the potential role of the specie Triatoma sordida (secondary vector) in the domestic cycle of transmission of Trypanosoma cruzi. Molecular techniques associated with entomological and epidemiological indicators were applied in 436 specimens of T. sordida captured in 147 dwellings of the Paraguayan Chaco. Infestation rate and colonization by T. Sordida was detected in the intradomicile and peridomiciliary in 12 (8.2%) and 79 (53.7%) of the 147 dwellings, respectively. In 12 houses were colonization was observed, at least one specimen was PCR-T. cruzi positive, and in two of them genotype TC2 of T. cruzi were detected innymphs by molecular characterization. Adults and nymphs in the peridomiciliary of 4 houses were positive for genotype TC1.A high risk of indoor transmission of T. cruzi is estimated in 87%. These results demonstrate adaptive capacity of this specie in the intradomicile, and increased vector potential to transmit Chagas disease in the Paraguayan Chaco.

Keywords : T. cruzi; genotypes, T. sordida; infestation; colonization.

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