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ON THE POSSIBILITY OF AUTOCHTHONOUS CHAGAS DISEASE IN RORAIMA, AMAZON REGION, BRAZIL, 2000-2001
Alternative title
Sobre a possibilidade da ocorrência de doença de Chagas autóctone em Roraima, Amazônia brasileira, 2000-2001Author
Affilliation
Universidade Federal de Roraima, Centro de Ciências Biológicas e da Saúde. Núcleo Avançado de Vetores. Convênio Fiocruz-UFRR. Boa Vista, RR, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Medicina Tropical. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Coleção Entomológica. Rio de Janeiro, RJ, Brasil
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Medicina Tropical. Rio de Janeiro, RJ, Brasil.
Universidade Federal de Roraima, Centro de Ciências Biológicas e da Saúde. Núcleo Avançado de Vetores. Convênio Fiocruz-UFRR. Boa Vista, RR, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Entomologia. Laboratório de Transmissão de Hematozoários. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Medicina Tropical. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Coleção Entomológica. Rio de Janeiro, RJ, Brasil
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Medicina Tropical. Rio de Janeiro, RJ, Brasil.
Universidade Federal de Roraima, Centro de Ciências Biológicas e da Saúde. Núcleo Avançado de Vetores. Convênio Fiocruz-UFRR. Boa Vista, RR, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Entomologia. Laboratório de Transmissão de Hematozoários. Rio de Janeiro, RJ, Brasil.
Abstract
Chagas disease has been almost entirely eradicated from the arid zones in Central and Northeastern Brazil where rare or no
autochthonous cases have been reported. However, in the last 10 years the disease has increasingly been registered in the Amazon
Region. Aiming to investigate the possibility of the occurrence of autochthonous cycle of Chagas disease in Roraima, triatomine
collections, vectorial susceptibility studies (this one to be shown elsewhere), parasitological and serological analyses were conducted
in three agricultural settlement areas (Rorainópolis, Passarão Project and Ilha Community). Blood-donor candidates were also
investigated. This is the first epidemiological survey on Chagas disease conducted in agricultural settlements in Roraima. Triatomine
species found were Triatoma maculata, Rhodnius pictipes, Rhodnius robustus and Panstrongylus geniculatus. Trypanosoma cruzi
detection analyses included xenodiagnosis, indirect immunofluorescence, indirect hemaglutination, ELISA and kinetoplast PCR
amplification. Natural triatomine infection was not found in intestinal contents. Twenty-five adult settlers (1.4% out of 1821, all
> 15 year-old, 20 migrants) presented anti-T. cruzi antibodies. Two migrant settlers (from Minas Gerais and Maranhão) tested
positive for more than two serological tests, besides either being positive for xenodiagnosis or PCR. Results show that Chagas
disease is not endemic in the areas studied. However, all elements of the transmission cycle are present, demanding for an
adequate and continuous vigilance.
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