search
for
 About Bioline  All Journals  Testimonials  Membership  News  Donations


Memórias do Instituto Oswaldo Cruz
Fundação Oswaldo Cruz, Fiocruz
ISSN: 1678-8060
EISSN: 1678-8060
Vol. 105, No. 4, 2010, pp. 499-503
Bioline Code: oc10087
Full paper language: English
Document type: Research Article
Document available free of charge

Memórias do Instituto Oswaldo Cruz, Vol. 105, No. 4, 2010, pp. 499-503

 en The effect of early infection with Echinostoma paraensei check for this species in other resources on the interaction of Schistosoma mansoni check for this species in other resources with Biomphalaria glabrata check for this species in other resources and Biomphalaria tenagophila check for this species in other resources
Garcia, Juberlan Silva; Junior, Arnaldo Maldonado; Bidau, Cláudio Juan; Corrêa, Ligia dos Reis; Lanfredi, Reinalda Marisa & Coelho, Paulo Marcos Zech

Abstract

Infection caused by the trematode Echinostoma paraensei check for this species in other resources has been shown to interfere in the natural resistance to infection by Schistosoma mansoni check for this species in other resources . Biomphalaria glabrata check for this species in other resources is susceptible to infection, while Taim isolate Biomphalaria tenagophila check for this species in other resources is resistant to infection by S. mansoni. These two snail species were assessed for infection with E. paraensei two days after exposure to S. mansoni miracidia. The number of B. tenagophila and B. glabrata infected with E. paraensei was lower in co-infected group, suggesting an antagonistic relationship. B. glabrata showed an increase in its susceptibility to S. mansoni, whereas B. tenagophila maintained its refractoriness to S. mansoni infection. Weekly comparisons made between the E. paraensei cercariae released from B. tenagophila and B. glabrata mono-infected snails revealed no quantitative differences. In contrast, S. mansoni cercariae released were higher in the B. glabrata co-infected group. Mortality rates were significantly greater in both species pertaining to co-infected group and unexpected mortalities were also observed in B. tenagophila exposed only to S. mansoni miracidia. Our study revealed that the B. tenagophila Taim isolate is susceptible to E. paraensei infection, although infection did not alter its resistance to S. mansoni infection.

Keywords
Echinostoma paraensei - Schistosoma mansoni - Biomphalaria tenagophila - Biomphalaria glabrata - resistance

 
© Copyright © 2010 - Instituto Oswaldo Cruz - Fiocruz
Alternative site location: http://memorias.ioc.fiocruz.br

Home Faq Resources Email Bioline
© Bioline International, 1989 - 2017, Site last up-dated on 16-Oct-2017.
Site created and maintained by the Reference Center on Environmental Information, CRIA, Brazil
System hosted by the Internet Data Center of Rede Nacional de Ensino e Pesquisa, RNP, Brazil