Passage of Eggs by Hosts Infected with Schistosoma mansoni, with Emphasis on Rodents

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Abstract
The egg-passage pattern of Egyptian Schistosoma mansoni has been followed in a series of wild and laboratory mammals representing hosts with different grades of susceptibility and thus vary -ing host-parasite relationships. Egg counts have shown that the passage of. eggs irrespective of hosts have a tendency, quantitively, to follow the path of a normal curve. Irregularities in this curve, deviation in the'' proportion of viable to nonviable eggs, and termination of egg passage differs with the host species and may even be an individual characteristic. Examinations of many hosts over a period of months indicate that the passage of nonviable schistosome eggs is probably a normal situation resulting from a release of aged and tissue-bound eggs by the host.

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