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. 2015 Nov;93(5):994-7.
doi: 10.4269/ajtmh.15-0156. Epub 2015 Sep 8.

Molecular Identification of Food Sources in Triatomines in the Brazilian Northeast: Roles of Goats and Rodents in Chagas Disease Epidemiology

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Molecular Identification of Food Sources in Triatomines in the Brazilian Northeast: Roles of Goats and Rodents in Chagas Disease Epidemiology

Carolina Valença-Barbosa et al. Am J Trop Med Hyg. 2015 Nov.

Abstract

We used the gut contents of triatomines collected from rural areas of Ceará State, northeastern Brazil, to identify their putative hosts via vertebrate cytb gene sequencing. Successful direct sequencing was obtained for 48% of insects, comprising 50 Triatoma brasiliensis, 7 Triatoma pseudomaculata, and 1 Rhodnius nasutus. Basic local alignment search tool (BLAST) procedure revealed that domestic animals, such as chickens (Gallus gallus) and goats (Capra hircus), are the main food source, including in sylvatic environment. Native hosts were also detected in peridomestic environment such as reptiles (Tropidurus sp. and Iguana iguana) and the Galea spixii (Rodentia: Caviidae). The role of goats and Galea spixii in Chagas disease epidemiology calls for further studies, because these mammals likely link the sylvatic and domestic Trypanosoma cruzi cycles.

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Figures

Figure 1.
Figure 1.
Collection area of triatomines in the low Jaguaribe Valley, Ceará State, northeastern Brazil.
Figure 2.
Figure 2.
DNA sequences from triatomine blood meals according to host (A) and ecotope (B). Details about 1) GeneBank code, 2) percentage of basic local alignment search tool (BLAST) identity, and 3) triatomine ecotope distributions are given in Supplemental Table 1.

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