Abstract

BARRIOS, María Gabriela et al. Effect of aquatic organisms (rotifers and ciliate) on the issuance of Schistosoma mansoni larvae by Biomphalaria glabrata maintained in laboratory. Salus [online]. 2013, vol.17, suppl.1, pp.39-45. ISSN 1316-7138.

The rotifers and ciliates are microorganisms that coexist with B. glabrata, Inside tissues normally infected by S. mansoni in the snails. the causative agent of schistosomiasis. The captive breeding experience suggests that the presence of such microorganisms can affect the evolution of the parasite in the snail, because competition for space and nutrients. The effect of rotifers and ciliates in the release of cercariae of S. mansoni by the mollusc B. glabrata maintained in captivity. The experimental setting was constituted by five groups of snails (n=10) infected with 10 miracidia from S. mansoni, which were placed in plastic containers with (a) 87500 25000 rotifers and Paramecium sp, (b) 27000 54000 rotifers and Paramecium sp, (c) 800000 rotifers, (d) Paramecium sp 4500 and the same number of rotifers and (e) infection control group remained rotifers and ciliates. It was possible to observe an number-dependent inverse correlation between the release of cercaria from S. mansoni and the number of rotifers and Paramecium sp. Used in this study. Particularly, the percentage of inhibition was strongly associated with the presence of large numbers of rotifers. To date, these are the first findings suggesting that microorganisms from the genus ciliata, subphylum Crustacea, are capable of regulating S. mansoni lyfe cycle progression in the snail stage, therefore could be potentially used as biological controls for the infection caused by S. mansoni.

Keywords : Biomphalaria glabrata; Schistosoma mansoni; rotifers; Paramecium sp.

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