Eimeria colchici infection in chickens: the invasion and local immune response of a non-specific host
2001
Looszova, A. | Revajova, V. | Goldova, M. | Pistl, J. | Csizsmarova, G. | Letkova, V. (University of Veterinary Medicine, Kosice (Slovak Republic))
The local immune response of chickens, as a non-specific host to, experimental infection with Eimeria colchici, coccidia from pheasants, was studied. The pheasant Eimeria invaded the intestine of the chickens not only in the caecum, as is the case in the natural host, but also in the cranial part of the intestine (duodenum). In these two infected areas we subsequently counted the number of CD3 positive T lymphocytes and eosinophilic granulocytes (heterophils and eosipnophils). The numbers of eosinophilic granulocytes gradually increased during the infection period. Immunohistochemical staining on paraffin sections was used to characterize CD3 positive lymphocytes. We observed a marked increase in CD3 positive cells from 36 hours post infection onwards. In conclusion, the significant increase of CD3 positive lymphocytes after the infection suggests that these cells are involved in the induction of the immune response and might prevent the further development of Eimeria in this non-specific host.
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