The serological relationship of a British Theileria with other Theileria species using the indirect fluorescent antibody test.

Antisera and antigens of a Theileria species isolated from British cattle were compared with those of six strains of Theileria mutans from geographically separated areas in East and South Africa, using the indirect fluorescent antibody (IFA) test. It was found that the British Theileria species did not react in the IFA test with these strains of T mutans. The British Theileria species was also compared with a variety of other Theileria species using the IFA test and no reactions were detected. It was concluded that the British Theileria species, which has been designated T mutans Essex, could be distinct from African T mutans.