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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 93, No. 6, 1998, pp. 711-717
Bioline Code: oc98197
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 93, No. 6, 1998, pp. 711-717

 en An Investigation on the Ecology of Triatoma vitticeps (Stal, 1859) and its Possible Role in the Transmission of Trypanosoma cruzi, in the Locality of Triunfo, Santa Maria Madalena Municipal District, State of Rio de Janeiro, Brazil
Teresa Cristina M Gonçalves; Edson de Oliveira; Lidiamara S Dias; Magaly D Almeida; Wagner O Nogueira & Fernando Dias de Ávila Pires

Abstract

From January 1989 to April 1995, 465 specimens of Triatoma vitticeps
 were collected in the locality of Triunfo, 2nd District of Santa Maria Madalena municipal district,
 State of Rio de Janeiro. The bugs were found indoors by local residents with predominance
 of adults. The flight activity was high in hot months when the incidence in the domicile also
 increased. Two hundred and two bugs (111 alive and 91 dead) were examined for
 Trypanosoma cruzi infection. This was detected in 31 of the dead bugs (34%) and 88
 (79%) of the live bugs examined. With a view to investigate the possible vertebrate hosts of
 the T. cruzi isolates, the blood of 122 mammals was examined through
 Giemsa-stained smears, hemocultures and xenodiagnosis. T. cruzi was detected in three specimens
 of Didelphis marsupialis and T. (M.) theileri was detected in one specimen
 of Bos taurus. The parasites were isolated from triatomine feces, xenoculture and
 hemoculture. No evidence of human infection was detected in 58 inhabitants examined, as
 evaluated by indirect imunofluorescence technique using T. cruzi epimastigotes as
 antigens. These results show that T. vitticeps is still a sylvatic species although
 nymphs have been found inside the domicile. Thus, an epidemiological vigilance is necessary to
 know the behaviour of this species following the continuous modifications promoted by the
 presence of man.

Keywords
Triatoma vitticeps - ecology - Trypanosoma cruzi - State of Rio de Janeiro - Brazil

 
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