In Biomphalaria glabrata snails already harboring Echinostoma lindoense, attempts at reinfection with the same trematode species failed when the interval between exposures was 6 days or more. With 2 days between exposures, the experimental snails were as susceptible to reinfection as the control snails. Between these limits, the reinfection failure rate increased with the exposure interval. Failure to reinfect the snails was probably due to cannibalism, young sporocysts from the second infection being swallowed by predatory rediae from the first infection. Development of sporocysts in successfully reinfected snails was normal. © 1975.
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