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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 97, No. 5, 2002, pp. 613-620
Bioline Code: oc02117
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 97, No. 5, 2002, pp. 613-620

 en The Opossum Didelphis virginiana check for this species in other resources as a Synanthropic Reservoir of Trypanosoma cruzi check for this species in other resources in Dzidzilché, Yucatán, México
Hugo A Ruiz-Piña & Alejandro Cruz-Reyes


In México, the role of mammals in the transmission cycle of Trypanosoma cruzi check for this species in other resources is poorly known. In the State of Yucatán, an endemic area of Chagas disease, both Didelphis virginiana check for this species in other resources and D. marsupialis occur sympatrically. However, until now, only the former species had been found infected with T. cruzi . To evaluate the role of D. virginiana in a peridomestic transmission, nine periods of capture-recapture were performed around the village of Dzidzilché, Yucatán. The sex, age, reproductive status, location, and presence of infection with T. cruzi were recorded for each opossum. The chromosome morphology was used to identify the opossum species. T. cruzi was identified by the presence of pseudocysts of amastigotes in cardiac muscle fibers of Balb/c mice inoculated with strains isolated from opossums. However, xenodiagnosis was the best diagnostic method. Triatoma dimidiata, the vector, were collected in and around the opossums' nests, and human dwellings; and were checked for T. cruzi . From 102 blood samples of D. virginiana examined 55 (53.9%) were positive to T. cruzi , the only two D. marsupialis captured were negative. Significant differences were found between infection, and both sex and reproductive condition. Eight out of 14 triatomines collected in peridomestic nests (57.1%), and 32 of 197 captured inside houses (16.3%) were found infected, suggesting a peridomestic transmission. The statistically high abundance of infected opossums and triatomines during the dry season (March to May) suggested the existence of a seasonality in the peridomestic transmission of T. cruzi in Dzidzilché.

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