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Four spirochetal isolates (JEM1 to JEM4) were obtained from cutaneous lesions of patients manifesting erythema chronicum migrans in Hokkaido, Japan. In the protein profiles by SDS-PAGE and the reactivities with monoclonal antibodies (H5332 and H9724) by immunoblotting, all the human isolates were identical with the tick isolates from Ixodes persulcatus. These data indicate that I. persulcatus is an important vector of
Lyme disease for humans in Japan.