Studies on the Immunity to Eimeria tenella in Chikens

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Abstract
The present experiments were conducted to study the mechanism of immunity to coccidia in relation to the passive transfer of immunity to Eimeria tenella by sera and spleen cells in chickens. The recipients which recieved injections of sera and cells were male commercial White Leghorn chickens of 2 or 2.5 weeks of age. The sera and cells used were obtained from immune chickens subjected to several inoculations with oocysts. The immune sera and cells were injected intraperitoneally or intravenously 24 hours before or after a single inoculation of oocysts, and protection against infection with parasites was determined by measurement of discharged oocysts following oral inoculation. The results are summarized as follows. Immunity to Eimeria tenella was not transferred adoptively with spleen cells from immune donors; after daily injections of immune spleen cells, passive transfer of immunity to Eimeria tenella was not detected as far as discharged oocysts concerned. In contrast, the immunity was transferred passively when the immnne sera were injected daily into the recipients, although the degree of protection was not so remarkable.

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