Domiciliation and sympatry of and risk of transmission in villages of Anzoátegui, Venezuela.
Journal:
Journal of parasitic diseases : official organ of the Indian Society for Parasitology
Published Date:
Jul 1, 2021
Abstract
The domiciliation of and and the entomological risk indicators for the transmission of , an etiological agent of Chagas Disease-CD, were studied in rural villages of Anzoátegui state, Venezuela. Nightly home visits were made for 4 months/year, for 2 years, to search for and capture triatomines in human settlements. For six of the evaluated villages, 16.4% (11/67) of houses were found with triatomine infestation; obtaining 151 triatomines in all their ontogenetic stages, of which 54.3% (82/151) corresponded to and 45.7% (69/151) to . In 7.5% of the evaluated houses, both species were presented in sympatry. Entomological indicators of transmission risk were higher for in relation to . Inoculation of fecal flagellates of triatomines produced 2.92 × 10 flagellates/mL of blood in mean and 100% mortality in the murine model. Molecular tests (satellite DNA, kDNA and DTUs studies) demonstrated the presence of all compatible with TcI. The food source determined by IESPA, revealed that showed less eclecticism in relation to in the use of blood sources. This could be an indicator of an older domiciliation with low dispersion between ecotopes. The sympatry of and had been recorded in natural niches, but for the first time it is recorded inside the houses in rural villages of the Anzoátegui state. Human dwellings can constitute an adequate niche, with available food sources for both triatomines species and with the risk of establishing AT/CD as zoonosis or zooanthroponosis.
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