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https://www.arca.fiocruz.br/handle/icict/12087
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2015-12-31
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- IOC - Artigos de Periódicos [12507]
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ARE MEMBERS OF THE TRIATOMA BRASILIENSIS (HEMIPTERA, REDUVIIDAE) SPECIES COMPLEX ABLE TO ALTER THE BIOLOGY AND VIRULENCE OF A TRYPANOSOMA CRUZI STRAIN?
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biodiversidade Entomológica. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biodiversidade Entomológica. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Nacional e Internacional de Referência em Taxonomia de Triatomíneos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Transmissores de Leishmaniose. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Doenças Parasitárias. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biodiversidade Entomológica. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório Nacional e Internacional de Referência em Taxonomia de Triatomíneos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Transmissores de Leishmaniose. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Doenças Parasitárias. Rio de Janeiro, RJ, Brasil.
Abstract
Trypanosoma cruzi is the causative agent of Chagas disease, transmitted to
humans and mammals by blood-sucking hemipteran insects belonging to
the Triatominae subfamily. The two main genotypes of T. cruzi (TcI and
TcII) differ in many characteristics concerning their genetic profile. Despite
the extensive literature on vectors and the etiologic agent, several interactive
aspects between these two elements of Chagas disease are still
waiting to be further clarified. Here, biological and histological features
resulting from the interaction between Albino Swiss mice and T. cruzi
isolate PB913 after passages through vectors of the Triatoma brasiliensis
species complex were evaluated. Comparing the four members of the
T. brasiliensis species complex—Triatoma brasiliensis brasiliensis Neiva,
Triatoma brasiliensis macromelasoma Galvão, Triatoma melanica Neiva
& Lent, and Triatoma juazeirensis Costa & Felix—no significant differences
in parasitemia of the infected mice were observed. At 20 days post-infection,
the highest number of parasites was observed in the group of mice
that were infected with parasites obtained from T. b. macromelasoma.
Tropism of the parasites to different organs such as heart, bladder, and
skeletal muscles followed by inflammatory cell infiltrates was observed
with quantitative and qualitative differences. Even though the four members
of the T. brasiliensis species complex differ in their geographical
distribution, morphology, biology, ecology, and genetics, no significant
influence on the parasitemia of the T. cruzi PB913 isolate was detected.
After evaluation of the tissue samples, a higher pathogenicity of parasites
obtained from T. b. brasiliensis was noticeable.
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