The life cycle of Theileria sergenti(T sergenti) in cattle, especially Korean native cattle, was not proved clearly. To find schizont stage in the life cycle of T sergenti in Korean cattle, T sergenti schizonts in the cells of parotid lymph nodes from 10 adult Korean cattle were examined.
Lymphoid cells which were separated from these lymph nodes were cytocentrifuged to observe the parasites in the cells.
T sergenti schizonts were detected in the cells of lymph nodes of 6 cattle out of them by IFA (Indirect Fluorescent Antibody) test and Giemsa stain.
By peroxidase stain, the cells which contain schizonts were proved lymphoid cells.
T sergenti schizonts identified by IFA test were able to be restained by Giemsa stain.
Also, merozoites were observed in peripheral blood of the same 6 cattle that had schizonts, by giemsa stain, but not observed in the 4 cattle that had not been detected schizonts.
As a part of life cycle of T sergenti, schizonts were observed in the lymphoid cells of Korean cattle.
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