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
Article
en En
| LILACS
| ID: lil-410849
Biblioteca responsable:
BR1.1
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.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
LILACS
Asunto principal:
Triatoma
/
Trypanosoma cruzi
/
Enfermedad de Chagas
/
Insectos Vectores
Tipo de estudio:
Risk_factors_studies
Límite:
Animals
País/Región como asunto:
America do sul
/
Argentina
Idioma:
En
Revista:
Mem Inst Oswaldo Cruz
/
Mem. Inst. Oswaldo Cruz
/
Mem. Inst. Oswaldo Cruz (Online)
/
Memórias do Instituto Oswaldo Cruz (Impresso)
/
Proceedings of the Instituto Oswaldo Cruz
Asunto de la revista:
MEDICINA TROPICAL
/
PARASITOLOGIA
Año:
2005
Tipo del documento:
Article
/
Project document
País de afiliación:
Argentina