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Effects of non-susceptible hosts on the infection with Trypanosoma cruzi of the vector Triatoma infestans: an experimental model
P Vázquez, Diego; Canale, Delmi; Gürtler, Ricardo E.
Afiliação
  • P Vázquez, Diego; Universidad de Buenos Aires.
  • Canale, Delmi; Serviço Nacional de Chagas.
  • Gürtler, Ricardo E; Universidad de Buenos Aires.
Mem. Inst. Oswaldo Cruz ; 94(3): 413-9, May-Jun. 1999. tab
Artigo em Inglês | LILACS | ID: lil-239051
Biblioteca responsável: BR15.1
ABSTRACT
We tested experimentally the effects of the presence of non-susceptible hosts on the infectin with Trypanosoma cruzi of the vector Triatoma infestans. The experiment consisted in two treatments with chickens, including two chickens (non-susceptible hosts) and two infected guinea pigs (susceptible hosts), and without chickens, including only two infected guinea pigs. The hosts were held unrestrained in individual metal cages inside a closed tulle chamber. A total of 200 uninfected T. infestand third instar nymphs were liberated in each replica, collected on day 14, and examined for infection and blood meal sources on day 32-36. The additional presence of chickens relative to infected guinea pigs (a) significantly modified the spatial distribution of bugs; (b) increased significantly the likelihoods of having a detectable blood meal on any host and molting to the next instar; (c) did not affect the bugs ' probability of death by predation; and (d) decreased significantly the overall percentage of T. infestand infected with T. cruzi. The bugs collected from inside or close to the guinea pigs ' cages showed a higher infection rate (71-88 por cento) than those collected from the chickens ' cages (22-32 por cento). Mixed blood meals on chickens and guinea pigs were detedted in 12-21 por cento of bugs. Although the presence of chickens would decrease the overall percentage of infected bugs in short term experiments, the high rate of host change of T. infestans would make this difference fade out if longer exposure times had been provided.
Assuntos
Texto completo: Disponível Coleções: Bases de dados internacionais Contexto em Saúde: ODS3 - Saúde e Bem-Estar / Doenças Neglicenciadas Tema em saúde: Meta 3.3: Acabar com as doenças tropicais negligenciadas e combater as doenças transmissíveis / Zoonoses Base de dados: LILACS Assunto principal: Triatoma / Trypanosoma cruzi / Epidemiologia Experimental / Triatominae / Doença de Chagas / Cobaias Limite: Animais Idioma: Inglês Revista: Mem. Inst. Oswaldo Cruz Assunto da revista: Medicina Tropical / Parasitologia Ano de publicação: 1999 Tipo de documento: Artigo País de afiliação: Argentina

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Texto completo: Disponível Coleções: Bases de dados internacionais Contexto em Saúde: ODS3 - Saúde e Bem-Estar / Doenças Neglicenciadas Tema em saúde: Meta 3.3: Acabar com as doenças tropicais negligenciadas e combater as doenças transmissíveis / Zoonoses Base de dados: LILACS Assunto principal: Triatoma / Trypanosoma cruzi / Epidemiologia Experimental / Triatominae / Doença de Chagas / Cobaias Limite: Animais Idioma: Inglês Revista: Mem. Inst. Oswaldo Cruz Assunto da revista: Medicina Tropical / Parasitologia Ano de publicação: 1999 Tipo de documento: Artigo País de afiliação: Argentina
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