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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 1, 2002, pp. 43-46
Bioline Code: oc02006
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 1, 2002, pp. 43-46

 en Triatomines Involved in Domestic and Wild Trypanosoma cruzi check for this species in other resources Transmission in Concepción, Corrientes, Argentina
María Esther Bar; Miryam Pieri Damborsky; Elena Beatriz Oscherov; Alicia María Francisca Milano; Gilberto Avalos & Cristina Wisnivesky-Colli

Abstract

An entomological and serological survey was performed in three localities of the Department of Concepción, Province of Corrientes, Argentina in 1998 and 1999, to identify triatomines species involved in domestic and wild transmission of Chagas disease. Triatomines were collected by man/hour capture in 32 houses randomly selected and 44 nearby outdoor ecotopes. Trypanosoma cruzi check for this species in other resources infection in triatomines was assessed by direct microscopic observation (400x) of feces and polymerase chain reaction. Serological techniques used for people were Indirect Hemagglutination Test and Indirect Fluorescent Test. Triatomines were collected in 28.1% of the houses and 31.8% of the wild biotopes. Triatoma infestans check for this species in other resources (Klug 1834) was exclusively found indoors and T. cruzi infected 60% of them. Triatoma sordida check for this species in other resources (Stål 1859) was mainly found in extradomestic ecotopes where trypanosome infection rate reached 12.7%. Serological study of 98 local people showed that 29.6% were seroreactive; most of their houses were closed to wild biotopes colonized by T. sordida.
Results indicate that there is an active T. infestans mediated transmission of Chagas disease in this zone that yields important human prevalence and that the populations of T. sordida in wild biotopes not only sustain the wild T. cruzi cycle but also represent an actual risk for people living in the area.

Keywords
Diptera, cattle dung, dung flies, diversity, seasonality, Brazil

 
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