Volume 12, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Laboratory experiments involved exposure of 1,521 Puerto Rican fresh-water mollusks of 22 species to miracidia of . Frequency of observed penetration in descending order was as follows: , and . Successful infection with shedding of cercariae was observed in , and . Eighteen of 642 (3%) infected involved 3 of 64 collections, and four of 172 (2%) infected involved 2 of 25 collections. This is believed to be the first report of infection of with , adding a third known potential intermediate host snail species in Puerto Rico.

Results suggested that susceptibility in and has a genetic basis and that successful infection of these species by was influenced by the effect of prior penetration by miracidia of or other trematodes.


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