1921
Volume s1-26, Issue 5
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Summary

Nine additional species and subspecies of native American planorbids have been exposed to infection with , with negative results; additional attempts have been made to infect certain species which had been tested earlier.

Additional laboratory studies have been conducted with a species of which has proved susceptible to infection. To date, 9 specimens have been infected; all of these snails came, or were progeny of snails which came, from a lake on the campus of Louisiana State University at Baton Rouge, Louisiana. Subsequent to exposure of 22 wild adult specimens and of 77 laboratory-reared juveniles, 2 and 7 snails, respectively, or 9 percent, shed cercariae of . On the other hand, there are described unsuccessful attempts to infect tropicorbids which, however, appear to be different species and which were collected from two different sites.

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