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The fate of Fasciola hepatica metacercariae following challenge infection of immune rats

Published online by Cambridge University Press:  05 June 2009

G. R. Rajasekariah  and
M. J. Howell
G. R. Rajasekariah
Affiliation:
Department of Zoology, Australian National University, Box 4 PO, Canberra ACT 2600, Australia
M. J. Howell
Affiliation:
Department of Zoology, Australian National University, Box 4 PO, Canberra ACT 2600, Australia
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Abstract

Groups of rats, infected 7 weeks previously with Fasciola hepatica, together with appropriate control groups, were challenged either orally or intraperitoneally with 30 metacercariae. The mean worm recovery from the previously infected, orally challenged rats was significantly lower than from their respective controls (2.2 ± 1.1 worms as opposed to 9.0 ± 2.6). There was no significant difference in mean worm recovery from the previously infected, intraperitoneally challenged rats and their respective controls (5.3 ± 3.2 worms as opposed to 6.2 ± 1.9). Livers of the orally challenged group appeared to be largely free from secondary damage but considerable damage was evident in rats which received an intraperitioneal challenge. This evidence supports the view that the gut acts as an important barrier to metacercariae of a challenge infection. In a further experiment, young flukes were recovered from the gut, abdominal cavity and liver of immune and control rats 9, 18, 27, 36 and 45 h after oral challenge. It was found that fewer flukes successfuly penetrated the guts of immune rats (3%) than those of uninfected controls (13%), again pointing to the gut as a barrier to metacercariae of a challenge infection. Protective mechanisms that may oprate at the level of the gut are discussed.

Type
Research Article
Information
Journal of Helminthology , Volume 51 , Issue 4 , December 1977 , pp. 289 - 294
Copyright
Copyright © Cambridge University Press 1977

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References

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