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Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 96, No. s1, 2001, pp. 193-198
Bioline Code: oc01174
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 96, No. s1, 2001, pp. 193-198

 en Changes on Schistosoma mansoni check for this species in other resources (Digenea: Schistosomatidae) Worm Load in Nectomys squamipes check for this species in other resources (Rodentia: Sigmodontinae) Concurrently Infected with Echinostoma paraensei check for this species in other resources (Digenea: Echinostomatidae)
Arnaldo Maldonado Júnior; Renata Coura; Juberlan da Silva Garcia; Reinalda Marisa Lanfredi & Luis Rey

Abstract

The water rat, Nectomys squamipes check for this species in other resources , closely involved in schistosomiasis transmission in Brazil, has been found naturally infected simultaneously by Schistosoma mansoni check for this species in other resources and Echinostoma paraensei check for this species in other resources . Laboratory experiments were conducted to verify parasitic interaction in concurrent infection. It was replicated four times with a total of 42 water rats and essayed two times with 90 mice pre-infected with E. paraensei check for this species in other resources . Rodents were divided into three groups in each replication. A wild strain recently isolated from Sumidouro, RJ, and a laboratory strain of S. mansoni check for this species in other resources from Belo Horizonte (BH) was used. Rats infected with E. paraensei were challenged 4 weeks later with S. mansoni and mice 2 or 6 weeks after the infection with S. mansoni. Necropsy took place 8 weeks following S. mansoni infection. The N. squamipes check for this species in other resources treatment groups challenged with S. mansoni RJ strain showed a significant decrease (80 and 65%) in the S. mansoni parasite load when compared with their respective control groups. There was a significant change or no change in the hosts challenged with the BH strain. The persistence time of E. paraensei within host was extended in relation to control groups, with a consequent enhancement of the number of recovered worm. An E. paraensei strain-specific influence on S. mansoni parasitism is reported. This paper presents some experimental data about this interaction in N. squamipes and Mus musculus check for this species in other resources .

Keywords
Nectomys squamipes, Schistosoma mansoni, Echinostoma paraensei, concurrent infection, heterologous interaction

 
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