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Immunological relationships during primary infection with Heligmosomoides polygyrus (Nematospiroides dubius): dose-dependent expulsion of adult worms

Published online by Cambridge University Press:  06 April 2009

M. Robinson ,
F. Wahid ,
J. M. Behnke  and
F. S. Gilbert
M. Robinson
Affiliation:
MRC Experimental Parasitology Research Group, Department of Zoology, University of Nottingham, University Park, Nottingham NG7 2RD
F. Wahid
Affiliation:
MRC Experimental Parasitology Research Group, Department of Zoology, University of Nottingham, University Park, Nottingham NG7 2RD
J. M. Behnke*
Affiliation:
MRC Experimental Parasitology Research Group, Department of Zoology, University of Nottingham, University Park, Nottingham NG7 2RD
F. S. Gilbert
Affiliation:
Behavioural Ecology Research Group, Department of Zoology, University of Nottingham, University Park, Nottingham NG7 2RD
*
Author to whom reprint requests should be addressed.
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Summary

The survival of Heligmosomoides polygyrus was monitored during primary infections in female C57Bl10, NIH and BALB/c mice at low and high intensities of infection. Survivorship curves were fitted for each data set and analysed. C57Bl10 mice, given either low or high intensities of infection, harboured parasites for 28–37 weeks, heavier infections surviving marginally but significantly longer. Essentially the survivorship curves of H. polygyrus in C57Bl10 mice could be accounted for by senility, the increased probability of worms with a longer life-span occurring at high infection intensities and, possibly, by a contribution from host-protective immune mechanisms in the terminal stages of infection. The pattern of survivorship was different in NIH and BALB/c mice. NIH mice showed weak but significant density-dependent suppression of parasite loss and infections in this strain did not exceed 27·5 weeks in duration. Primary infections in BALB/c mice were briefer still and showed marked dependence on parasite density. Thus low-level infections lasted 10–15 weeks whereas heavier infections survived for 21–34 weeks. The data suggested that both strains developed host-protective responses to adult H. polygyrus and that parasite survival was curtailed earlier than would be expected if senility alone was involved. The hybrid strains (C57Bl10 × NIH)F1 and (B10G × NIH)F1 both expelled H. polygyrus in a dose-dependent manner, worm loss commencing within 10 weeks of infection. In some experiments worm loss was clearly evident by weeks 4 and 6. These hybrid strains showed gene complementation in that adult worms were cleared considerably earlier than in parental strains.

Type
Research Article
Information
Parasitology , Volume 98 , Issue 1 , February 1989 , pp. 115 - 124
Copyright
Copyright © Cambridge University Press 1989

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