Distribution and pathogenicity of Trypanosoma cruzi isolated from peridomestic populations of Triatoma infestans and Triatoma guasayana from rural Western Argentina
Mem. Inst. Oswaldo Cruz
;
100(2): 123-129, Apr. 2005. ilus, tab
Artículo
en Inglés
| LILACS
| ID: lil-410849
RESUMO
We assessed the distribution of Trypanosoma cruzi 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 percent) were infected with T. cruzi based on microscopical examination of feces. The prevalence of T. cruzi infection was 0.8 percent in Triatoma infestans, 2.3 percent 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 percent) of 14 microscope-positive bugs. Hemoculture was the most sensitive method (67 percent) followed by culture of organ homogenates, histopathology or xenodiagnosis of inoculated suckling mice (55-58 percent), and culture of microscope-positive bug feces (46 percent). 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.
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Índice:
LILACS (Américas)
Asunto principal:
Triatoma
/
Trypanosoma cruzi
/
Enfermedad de Chagas
/
Insectos Vectores
Tipo de estudio:
Factores de riesgo
Límite:
Animales
País/Región como asunto:
America del Sur
/
Argentina
Idioma:
Inglés
Revista:
Mem. Inst. Oswaldo Cruz
Asunto de la revista:
Medicina Tropical
/
Parasitología
Año:
2005
Tipo del documento:
Artículo
/
Documento de proyecto
País de afiliación:
Argentina
Institución/País de afiliación:
Administración Nacional de Laboratorios e Institutos de Salud "Dr. Carlos G. Malbrán"/AR
/
Coordinación Nacional de Control de Vectores/AR
/
Universidad de Buenos Aires/AR
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