Studies on the Life Cycle of Syphacia obvelata , a Common Nematode Parasite of Rats

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Abstract
Gravid females of S. obvelata migrate from the anus of the host; eggs are deposited on the skin of the anal region; here the eggs become fully embryonated and many of them hatch. Recently hatched, living larvae have been recovered not only on the body surfaces of the anal region but also in the posterior portion of the large intestine. The findings indicate that infection can occur by larvae entering the anus, that is by retrofection. Infection by mouth by licking infective eggs or larvae from the skin probably also occurs and must be the method whereby young rats acquire infection from an infected mother.

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