Reproduction of Echinostoma revolutum Rediae When Transferred to Uninfected Snails of Different Sizes

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Abstract
Mother rediae of E. revolutum were transplanted individually from infected to uninfected Stagnicola palustris ranging in length from 10 to 25 mm. The number of daughter rediae present at 30, 40, and 50 days after transfer was related to the size of the snail, progressively so with the age of the infection. There was also a direct relationship between the size of the snail and the maximum size attained by the rediae which in general was greater than that seen in naturally infected snails. When daughter rediae were transplanted in groups of 5 into snails 20 to 23 mm long, and examined 40 or 60 days later, none of the snails contained additional rediae and none of the rediae contained rediae and cercariae together, as is occasionally seen in natural infections.

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