[Histopathological studies in young Lymnae glabra Müller of live or of abortive infestation].

Very young snails had been individually exposed to a single miracidium of Fasciola hepatica; they were bred at 23 degrees C during 49 days and killed at days 42 and 49 postexposure for histological studies. Tissue lesions were observed in six organs of infected snails and none in uninfected and control snails. All snails with living parthenitae showed a necrotized and atrophic gonad; a reconstitution with epithelial hyperplasia was noted in the most digestive glands, kidneys and genital annex glands of these snails.

[Effect of the number of miracidia and age of the mollusc on the survival and degree of infestation of Lymnaea glabra Müller by Fasciola hepatica L].

This report summarizes studies on the infection of Lymnaea glabra by Fasciola hepatica in connection with the following: 1) the number of miracidia for a single exposure; 2) the snail height (0,5 mm, 1 mm or 2 mm) at miracidial exposure. Snails with evolutive infection were only observed in 0,5- and 1-mm-high groups at day post-exposure. In 0,5-mm-high groups, the percentage of these infected snails showed a peak for 5 miracidia per snail.