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Memorias del Instituto de Investigaciones en Ciencias de la Salud

On-line version ISSN 1812-9528


SANCHEZ, Zunilda et al. Blood meal source of specimens of Triatoma sordida in an area with high risk of domiciliation in the Paraguayan Chaco. Mem. Inst. Investig. Cienc. Salud [online]. 2018, vol.16, n.1, pp.78-83. ISSN 1812-9528.

In the present study we evaluated entomological indicators (infection rates, colonization and natural infection) of Triatoma sordida specimens captured in the intra and peridomicile of households of the Paraguayan Chaco in the period 2014 to 2016. The objective was to compare with the previously reported findings in the period 2010 to 2013 in the same region. In addition, the detection of the blood meal source has been incorporated as a complement to define the risk of domiciliation of this secondary vector. Molecular techniques associated with entomological and epidemiological indicators were applied to 220 T. sordida specimens captured in 67 dwellings in 24 locations in the Chaco. Infestation and colonization by T. sordida was detected in the intradomicile 13/67 (19%) and 5/13 (38%) and in the peridomiciliary 54/67 (81%) and 43/54 (80%), respectively. Infection with T. cruzi was detected in 17.3% of the samples analyzed. The blood meal source could be detected in only 13 of 220 specimens (6%), all were positive for chicken blood and corresponded to capture in the peridomicile. The rate of intradomiciliary infestation was 19%, higher than in previous years and similar to the historically endemic areas of the Western Region (18%-20%). The risk of intradomiciliary transmission remains high because in 3 out of 5 dwellings with nymphs of T. sordida, the specimens were infected with T. cruzi. The entomological indicators obtained in the present study agree with previous results of our team, and confirm the vectorial capacity of this secondary triatomine in the transmission of Chagas disease.

Keywords : T. sordida; infestation; colonization; natural infection; blood meal source..

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