Abstract
A total of 1659 Lymnaea stagnalis appressa Say were examined for trematode infection. Of these, 571 shed one, 215 shed two, and 15 shed three species of cercariae. Most of the snails, including at least one with three other species, contained metacercariae of Cotylurus flabelliformis. It is suggested that infection of snails by one trematode species may increase or decrease the mollusc's susceptibility to subsequent infection by other trematode larvae.

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