Effect of Schistosoma mansoni Infection upon Fecundity in Australorbis glabratus

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Abstract
Inhibition of egg-laying in Australorbis glabratus infected with Schistosoma mansoni is shown to begin in the 4th week of infection, before the onset of cercarial emergence. Egg production is resumed on a limited basis well before the loss of infection, about 90 to 100 days after miracidial penetration. Eggs produced by infected snails develop and hatch nearly normally, but their rate of production is only about 10% of normal. A marked difference in thermal resistance of normal and infected A. glabratus was noted.