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2.
Mem. Inst. Oswaldo Cruz ; 98(6): 783-787, Sept. 2003. tab
Artigo em Inglês | LILACS | ID: lil-348347

RESUMO

Experiments were carried out to analyze the biological characteristics of two sympatric isolates of Schistosoma mansoni derived from humans and murines in a low endemic transmission area (Sumidouro county, state of Rio de Janeiro, Brazil). Sympatric reared-laboratory Biomphalaria glabrata and C3H/He mice were used as experimental hosts. Parameters assessed comprised: precercarial period, infectivity and mortality (snails), prepatent period, infectivity (percentage of cercariae maturation into adult worm) and intestinal egg count (mice). The murine isolate showed a shorter precercarial period and higher infectivity than human isolate (p < 0.05). This biological heterogenicity did not correspond to the vertebrate data because any biological parameter presented significant difference (p > 0.05). These data suggest that both isolates are local sub-populations, providing support for the hypotheses that in a same biotope mixed populations or sub-populations circulate among their main host (human beings) and/or rodent as an anfixenous infection


Assuntos
Animais , Humanos , Camundongos , Biomphalaria , Interações Hospedeiro-Parasita , Schistosoma mansoni , Brasil
3.
Mem. Inst. Oswaldo Cruz ; 97(1): 127-132, Jan. 2002. ilus, tab
Artigo em Inglês | LILACS | ID: lil-306084

RESUMO

A comparative study was made between sympatric isolates of Schistosoma mansoni: one from a wild rodent (R) Nectomys squamipes and another one from humans (H) isolated from a low endemic schistosomiasis transmission area in Brazil. Our purpose was to detect differences between them concerning chaetotaxy (number and pattern of distribution of the argentophilic papillae) of the cercariae by means of silver impregnation. No significant difference (x > 0.05) between isolates was noted. Nevertheless, a significant difference (x < 0.05) was observed in the cercarial index (ratio of the distance between the first and the second preacetabular papillae and the distance between the first and the second dorsal preacetabular papillae) of male and female cercariae in both isolates. Males presented a greater cercarial index than females. By means of multivariate analysis, male cercariae were distinguished from female cercariae through the following characteristics: average number of dorsal papillae on the right quadrant, average number of ventral middle papillae on the right quadrant (H isolate) and average number of dorsal middle papillae on the left quadrant (R isolate). The results suggest that R and H isolates belong to the same population that could complete its life cycle in rodent-snail-rodent fashion


Assuntos
Humanos , Animais , Masculino , Feminino , Schistosoma mansoni , Diferenciação Sexual , Animais Selvagens , Brasil , Muridae , Schistosoma mansoni
4.
In. Sociedade Brasileira para o Progresso da Ciência. Cientistas do Brasil: depoimentos. Säo Paulo, Sociedade Brasileira para o Progresso da Ciência, 1995. p.175-92, ilus.
Monografia em Português | LILACS | ID: lil-234858

RESUMO

Introduz algumas notas biográficas sobre Leonidas de Mello Deane e Maria José von Paumgartten Deane e apresenta a entrevista por eles concedida a Nilcéa Freire e Sheila Kaplan, focalizando sua atuaçäo no campo da saúde pública no Brasil.(MAM)


Assuntos
Parasitologia , Saúde Pública/história , Ciência/história , Brasil , História da Medicina
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