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PFGE of 26 representative strains in lanes 2 to 27, with unrelated strains separated by vertical lines. Strains 1 to 7 are regional isolates, strains 8 to 12 are Massachusetts isolates, and strains 13, 14, and 16 to 26 are Cleveland isolates of serotype 6C. Strain 15 is a serotype 6A control, and strain 28 is a serotype 6B control. A DNA ladder with known fragment sizes is shown in lane 1, with sizes of bands (in kilobases) shown.
