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Experimental infection of laboratory rats with Corynosoma semerme (Acanthocephala)

Published online by Cambridge University Press:  06 April 2009

E. Tellervo Valtonen  and
Eero Helle
E. Tellervo Valtonen
Affiliation:
Department of Zoology and Perämeri Research Station, University of Oulu, Oulu, Finland
Eero Helle
Affiliation:
Department of Biology, University of Joensuu, Joensuu, Finland
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Summary

Ten albino rats injected with hydrocortisone were infected with 36–66 cystacanths of Corynosoma semerme in order to study the course of infection in a warm-blooded animal. Surveys were carried out 2, 5, 8, 14, 18, 21 and 28 days after infection. Recovery decreased from 60% after 2–5 days to 22% after 28 days. The proportion of males dropped markedly before the 8th day of infection. The worms were concentrated in the latter half of the intestine, the males being in a more anterior location on average. The males matured between the 2nd and 5th day of infection. Disintegrated ovaries were observed in some of the 2-day-old females, but mature free ovaries were seen only in 5-day-old females. By the 14th day many females contained fully developed eggs, but it was only after the 18th day that the number of eggs increased considerably. Male worms were not encountered in the 4-week-old infection. The females were longer than the males. In the present study, experimental infections are compared with other acanthocephalan infections in both birds and mammals.

Type
Research Article
Information
Parasitology , Volume 85 , Issue 1 , August 1982 , pp. 9 - 19
Copyright
Copyright © Cambridge University Press 1982

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