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Benign Theileria species distributed in China and Korea were characterized by allele-specific polymerase chain reaction (PCR), based on the sequences of major immunodominant piroplasm surface protein genes. In China, all the isolates contained Chitose (C) type parasites. One out of 5 isolates tested was a mixed population of Ikeda (I), C and B-2 types, whereas, all the isolates from Korea consisted of I type parasites. Except for 4 isolates, 29 isolates from Korea consisted of more than two types of parasites. The present data showed that benign Theileria species distributed in these countries were mixed parasite populations.