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Comparison of immune responses in inbred lines of chickens to Eimeria maxima and Eimeria tenella

Published online by Cambridge University Press:  06 April 2009

J. M. Bumstead
Affiliation:
Institute for Animal Health, Compton, Newbury, Berkshire RG16 0NN
N. Bumstead
Affiliation:
Institute for Animal Health, Compton, Newbury, Berkshire RG16 0NN
L. Rothwell
Affiliation:
Institute for Animal Health, Compton, Newbury, Berkshire RG16 0NN
F. M. Tomley
Affiliation:
Institute for Animal Health, Compton, Newbury, Berkshire RG16 0NN

Summary

Immune responses of 4 inbred lines of chickens, that differ in resistance to Eimeria maxima and E. tenella, were examined. Significant differences were found in in vitro proliferation of peripheral blood lymphocytes to E. maxima sporozoite antigen, the more resistant lines C and 72 having higher responses than the more susceptible line 151. These differences existed pre-infection and were enhanced following both primary and a second infection. The proportions of lymphocyte subsets in the peripheral blood following primary infection also differed between lines, with significantly higher percentages of CD8 + and TCR1 + lymphocytes circulating in the more resistant birds. In contrast, there were few differences between lines in either resistance or in in vitro proliferation of peripheral blood lymphocytes to E. tenella sporozoite antigen either pre-infection or following a primary infection. However, after a second infection when there were significant differences in resistance between lines, as measured by oocyst excretion, there were also significant differences in lymphoproliferation with the more resistant lines 151 and 62 having higher responses than the more susceptible line C. Thus for E. maxima there is a direct relationship between resistance to infection and lymphoproliferation in response to parasite antigen. This implies that differences in cellular immunity may account for differences in resistance between lines, and since these specific responses are enhanced by infection they may also reflect important immune mechanisms. For the rather less immunogenic E. tenella, the correlation between resistance and lymphoproliferation is not so clear. However, where there were significant differences between lines, i.e. after a second infection, the direct relationship between resistance and lymphoproliferation was upheld.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1995

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