Chickens were exposed to graded doses of a suspension of Eimeria tenella oocysts while in environments of high (HSS) or low (LSS) social stress. Both primary cellular resistance and the sensitization phase of cell-mediated immunity were higher in the HSS environment than in the LSS environment. The manifestation of cell-mediated immunity seems to be inhibited by social stress.
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W. B. Gross (1985) studied this question.