Abstract
Leptospira were isolated from soil obtained from Hokkaido, the northernmost island, to Okinawa, the southernmost island, of Japan using sulfamethoxazole, trimethoprim, amphotericin B, fosfomycin, and 5- fluorouracil. Fifty of 132 soil samples (37.9%) were culture-positive. On the basis of 16S-rDNA sequences, 12 of the isolated Leptospira were classified into a pathogenic species clade that is closely associated with L. alstonii and L. kmetyi. Nine isolates were classified as intermediate species and were found to be similar to L. licerasiae. Twenty-seven isolates were classified as non-pathogenic species, of which 23 were found to be related to L. wolbachii. Non-pathogenic Leptospira are commonly distributed in environmental soil.
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