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Title: SPOROZOITES OF AVIAN EIMERIA SPECIES ELICIT CROSS-SPECIES PROTECTION IN FOREIGN HOST BIRDS

Author
item Augustine, Patricia
item Danforth, Harry

Submitted to: American Association of Veterinary Parasitologists Proceedings
Publication Type: Abstract Only
Publication Acceptance Date: 7/9/1994
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Immunity that develops following active infection with the avian Eimeria is considered to be rigorously species specific and elicited by the schizogonic generations of the life cycle. However, when chickens were repeatedly inoculated with large doses of turkey coccidia, they became protected against challenge with 2 species of chicken coccidia, E. tenella and E. acervulina. Protection was primarily of weight gain and feed efficiency, with little effect on intestinal lesions. In contrast, turkeys, repeatedly inoculated with large doses of chicken coccidia did not develop protection against challenge with turkey coccidia. Although both the turkey and chicken coccidia invaded the foreign host bird, the sporozoites of the turkey coccidia survived for a longer period of time than those of the chicken coccidia. In vitro, sporozoites of E. tenella and turkey coccidium, E. adenoeides, invaded cultured peripheral blood monocytes of both the natural and foreign host. Within 4 hr PI, the chicken macrophages inoculated with E. adenoeides contained numerous vesicles that reacted with refractile-body specific monoclonal antibody; very few vesicles were observed in turkey macrophages that were inoculated with E. tenella.