[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. In 1-mm-high groups, there was no infected snails until 5 miracidia per snail; then the percentage of infected snails increased in connection with the number of miracidia used per snail. L. glabra is an accidental snail host for F. hepatica.