3 research outputs found
The effect of early infection with Echinostoma paraensei on the interaction of Schistosoma mansoni with Biomphalaria glabrata and Biomphalaria tenagophila
The effect of early infection with Echinostoma paraensei on the interaction of Schistosoma mansoni with Biomphalaria glabrata and Biomphalaria tenagophila
Infection caused by the trematode Echinostoma paraensei has been
shown to interfere in the natural resistance to infection by
Schistosoma mansoni . Biomphalaria glabrata is susceptible to
infection, while Taim isolate Biomphalaria tenagophila 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