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Rep-PCR analysis showing three groups of serotype 6C isolates closely related to serotype 6A isolates. Strains 1, 2, 4 to 6, 8, 10, 12 to 14, 16, 17, 19 to 21, and 23 to 25 are serotype 6C isolates, and strains 15, 27, and 30 to 35 are serotype 6A isolates.
