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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 100, No. 2, 2005, pp. 123-129
Bioline Code: oc05059
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 100, No. 2, 2005, pp. 123-129

 en Distribution and pathogenicity of Trypanosoma cruzi check for this species in other resources Trypanosoma cruzi isolated from peridomestic populations of Triatoma infestans check for this species in other resources and Triatoma guasayana check for this species in other resources from rural Western Argentina
Marta A Lauricella; Raúl L Stariolo; Adelina R Riarte; Elsa L Segura & Ricardo E Gürtler


We assessed the distribution of Trypanosoma cruzi check for this species in other resources infection in peridomestic triatomines collected manually at a district-wide scale in rural villages around Olta, Western Argentina, and typed the isolated strains according to their pathogenicity to laboratory mice. Of 1623 triatomines examined, only 14 (0.9%) were infected with T. cruzi based on microscopical examination of feces. The prevalence of T. cruzi infection was 0.8% in Triatoma infestans, 2.3% in T. guasayana, and nil in T. garciabesi, T. platensis, and T. eratyrusiformis. Local transmission occurred in kitchens, store-rooms and goat corrals or nearby, though at very low levels. T. cruzi was detected by at least one parasitological method in 11 (79%) of 14 microscope-positive bugs. Hemoculture was the most sensitive method (67%) followed by culture of organ homogenates, histopathology or xenodiagnosis of inoculated suckling mice (55-58%), and culture of microscope-positive bug feces (46%). The evidence suggests that most of the isolated T. cruzi strains would be myotropic type III. Our study establishes for the first time that peridomestic, microscope-positive T. guasayana nymphs were actually infected with T. cruzi, and may be implicated as a putative secondary vector of T. cruzi in domestic or peridomestic sites.

Trypanosoma cruzi - Triatoma infestans - Triatoma guasayana -Triatoma garciabesi - Chagas disease - surveillance - pathogenicity - Argentina

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