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DEVELOPMENT OF A TRYPANOSOMA CRUZI (TCI) ISOLATE IN THE DIGESTIVE TRACT OF AN UNFAMILIAR VECTOR, TRIATOMA BRASILIENSIS (HEMIPTERA, REDUVIIDAE)
Triatoma brasiliensis
Epimastigota
Ingestão de sangue
Metaciclogênese
Trypomastigote
Triatoma brasiliensis
Trypomastigote
Epimastigote
Blood ingestion
Metacyclogenesis
Affilliation
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanossomatídeos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanossomatídeos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanossomatídeos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanossomatídeos. Rio de Janeiro, RJ, Brasil.
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Biologia de Tripanossomatídeos. Rio de Janeiro, RJ, Brasil.
Abstract
Triatoma brasiliensis is an important vector of Trypanosoma cruzi, commonly found in semi-arid areas of north-eastern Brazil. T. cruzi (TcI) is a widely distributed genotype in all biomes of Brazil. To evaluate selective pressures exerted by a vector species on the development of TcI derived from a different biome (Atlantic Rainforest), T. brasiliensis larvae were infected with the MDID/BR/1994/C48 isolate. Parasite densities of T. cruzi were determined in three regions of the gut at 3, 5 and 10 days after feeding. Percentages of the different stages of the flagellate were identified in Giemsa stained smears. The TcI isolate possessed always significantly higher densities in the rectum than in the small intestine. Epimastigotes reached their highest percentage at 3 days after feeding in the small intestine and trypomastigotes at 10 days after feeding in the rectal wall. Additionally, high metacyclogenesis rates in the T. brasiliensis gut showed competence of this TcI strain to complete its life cycle in this unfamiliar vector species.
Keywords in Portuguese
Trypanosoma cruziTriatoma brasiliensis
Epimastigota
Ingestão de sangue
Metaciclogênese
Trypomastigote
Keywords
Trypanosoma cruziTriatoma brasiliensis
Trypomastigote
Epimastigote
Blood ingestion
Metacyclogenesis
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