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Immune control of murine coccidiosis: CD4+ and CD8+ T lymphocytes contribute differentially in resistance to primary and secondary infections

Published online by Cambridge University Press:  06 April 2009

M. E. Rose ,
P. Hesketh  and
D. Wakelin
M. E. Rose
Affiliation:
Houghton Laboratory, AFRC Institute for Animal Health, Houghton, Huntingdon, Cambs PE17 2DA
P. Hesketh
Affiliation:
Houghton Laboratory, AFRC Institute for Animal Health, Houghton, Huntingdon, Cambs PE17 2DA
D. Wakelin
Affiliation:
Department of Life Science, School of Biological Sciences, University of Nottingham, University Park, Nottingham NG7 2RD
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Summary

The effect of treatment with monoclonal antibodies (Mabs) which deplete CD4+ or CD8+ T lymphocytes, on infections with Eimeria spp. was examined in NIH mice. Treatment with anti-CD4 Mab increased susceptibility to primary infections with E. vermiformis or E. pragensis and reduced the subsequent resistance of the mice to homologous challenge. Similar treatment of immune mice did not affect their resistance to re-infection but this was reduced in mice depleted of CD8+ T lymphocytes. In mice immunized with E. vermiformis the effect of CD8+-depletion was very slight, apparent only as the presence of small numbers of oocysts in the faeces of some mice; in mice immunized with E. pragensis there was a small, though significant, increase in oocyst production, compared with controls and anti-CD4-treated groups. These results confirm the importance of mechanisms involving the function of CD4+ T lymphocytes in the control of primary infections with Eimeria spp. and indicate that CD8+ cells play some part in the expression of resistance to reinfection. They also show that a major part of this resistance was not affected by either of the treatments given.

Keywords

Eimeria pragensis, Eimeria vermiformis, coccidiosis, immunity, CD4+ T lymphocytes, CD8+ T lymphocytes.
Type
Research Article
Information
Parasitology , Volume 105 , Issue 3 , December 1992 , pp. 349 - 354
Copyright
Copyright © Cambridge University Press 1992

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