Please use this identifier to cite or link to this item: https://www.arca.fiocruz.br/handle/icict/3725
Title: Natural infection of wild rodents by Schistosoma mansoni parasitological aspects
Authors: Silva, Rosângela Rodrigues e
Silva, José Roberto Machado e
Faerstein, Nilcéa Freire
Lenzi, Henrique Leonel
Rey, Luis
Affilliation: Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Biologia. Rio de Janeiro, RJ, Brasil
Universidade do Estado do Rio de Janeiro. Departamento de Patologia e Laboratórios. Rio de Janeiro, RJ, Brasil
Universidade do Estado do Rio de Janeiro. Departamento de Patologia e Laboratórios. Rio de Janeiro, RJ, Brasil
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Laboratório de Patologia. Rio de Janeiro, RJ, Brasil
Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Biologia. Rio de Janeiro, RJ, Brasil
Abstract: he evaluation of the role of rodents as natural hosts of Schistosoma mansoni was studied at the Pamparrão Valley, Sumidouro, RJ, with monthly captures and examination of the animals. Twenty-three Nectomys squamipes and 9 Akodom arviculoides with a shistosomal infection rate of 56.5% and 22.2% respectively eliminated a great majority of viable eggs. With a strain isolated from one of the naturally infected N. squamipes, we infected 75% of simpatric Biomphalaria glabrata and 100% of albino Mus musculus mice. The adult worms, isolated from N. squamipes after perfusion were located mainly in the liver (91.5%) and the mesenteric veins (8.5%). The male/female proportion was 2:1. The eggs were distributed on small intestine segments (proximal, medial and distal portions) and the large intestine without any significant differences in egg concentration of these segments. In A. arviculoides, the few eggs eliminated by the stools were viable and there was litlle egg retention on intestinal segments. Considering the ease to complete S. mansoni biological cycle in the Nectomys/Biomphalaria/Nectomys system under laboratory conditions, probably the same is likely to occur in natural conditions. In support to this hypotesis there are also the facts that human mansonic shistosomiasis has a very low prevalence in Sumidouro and endemicity among the rodents has not changed even after repetead treatments of the local patients. Based on our experiments, we conclude that N. squamipes has become a natural host of S. mansoni and possibly may participate in keeping the cycle of schistosomiasis transmission at Pamparrão Valley.
Keywords: Schistosoma mansoni
Wild Rodents
Nectomys squamipes
Natural Infection
Akodon arviculoides
DeCS: Schistosoma mansoni
Roedores
Infecção
Issue Date: 1992
Publisher: Fundação Oswaldo Cruz. Instituto Oswaldo Cruz.
Citation: SILVA, Rosângela Rodrigues e et al. Natural infection of wild rodents by Schistosoma mansoni parasitological aspects. Memórias do Instituto Oswaldo Cruz v.87, sup.1, p. 271-276, 1992.
DOI: http://dx.doi.org/10.1590/S0074-02761992000500051
ISSN: 0074-0276
Copyright: open access
Appears in Collections:IOC - Artigos de Periódicos

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