Abstract
Protection against chicken leucocytozoonosis was assessed in chickens immunized with spleen homogenates from chickens that had received sporozoites of Leucocytozoon caulleryi 7 or 13 days previously. Chickens immunized with the homogenate were challenged with sporozoites of L. caulleryi and observed for changes in clinical signs, parasitemia, serum-soluble antigen, and antibody responses. In chickens immunized with either the 7-day or 13-day homogenate, clinical signs and parasitemia were moderate, mild or absent. This was the case both after immunization with the homogenate and after sporozoite challenge. Immunization with spleen homogenates demonstrated protection against chicken leucocytozoonosis.
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