The development of rediae of Fasciola hepatica in Radix natalensis subjected twice to bimiracidial exposures.

Abstract : Experimental infections of Egyptian Radix natalensis with a French isolate of Fasciola hepatica (each snail was subjected twice to a bimiracidial exposure) were carried out to determine how many sporocysts grew in these snails and to study the developmental patterns of redial generations. Single-sporocyst infections were found in 69.3% (34/49) of infected snails, with equivalent numbers of normal and abnormal patterns. Snails with two- and three-sporocyst infections were 24.4% and 6.1%, respectively. In single- and two-sporocyst infections at days 42 and 56 post-exposure, the total redial burden was significantly higher in snails with a normal redial development. In two- and three-sporocyst infections, the overall maturity of rediae was delayed at days 42 and 56. The high frequency of abnormal patterns in R. natalensis (53.1% of all infected snails showed degeneration of a first mother redia) might be due to incomplete adaptation between the snail population and the parasite. The delayed redial maturity in two- and three-sporocyst infections can mainly be explained by the volume of the snail body, which would be insufficient to allow the simultaneous differentiation of most rediae over time.
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Soumis le : mercredi 22 janvier 2014 - 15:52:00
Dernière modification le : lundi 12 mars 2018 - 10:26:02

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Y. Dar, Philippe Vignoles, Gilles Dreyfuss, Daniel Rondelaud. The development of rediae of Fasciola hepatica in Radix natalensis subjected twice to bimiracidial exposures.. Journal of Helminthology, Cambridge University Press (CUP), 2010, pp.1-5. ⟨10.1017/S0022149X10000453⟩. ⟨hal-00934788⟩

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