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Different levels of immunity to Schistosoma mansoni in the mouse: the role of variant cercariae

Published online by Cambridge University Press:  06 April 2009

M. A Smith  and
J. A. Clegg
M. A Smith
Affiliation:
Wellcome Research Laboratories, Langley Court, Beckenham, Kent BR3 3BS
J. A. Clegg
Affiliation:
Wellcome Research Laboratories, Langley Court, Beckenham, Kent BR3 3BS
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Summary

Very variable levels of immunity to a second infection with Schistosoma mansoni were recorded in 7 strains of mice, 12–15 weeks following a small primary infection. When 2 or more strains of mice were assayed at the same time, less variation occurred within the experiment than between different experiments. This evidence suggested variation between pools of cercariae as the main cause of variability in immunity. In direct experiments in one strain of mouse, 2 different pools of cercariae stimulated widely different levels of immunity to the same challenge. Conversely, challenge infections drawn from different pools showed different susceptibility to immunity stimulated by the same primary infection. Individual clones of cercariae, from snails infected with single miracidia, showed a high level of susceptibility to immunity stimulated by a small bisexual infection, or were not susceptible at all. Antigenic polymorphism is the most likely explanation for the differences observed between clones of cercariae. However, indirect immunofluorescence showed the presence of at least 1 common antigen on the surface of schistosomula derived from different clones of cercariae and clone-specific antigens have not been detected.

Type
Research Article
Information
Parasitology , Volume 78 , Issue 3 , June 1979 , pp. 311 - 321
Copyright
Copyright © Cambridge University Press 1979

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References

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