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Dendrogram of the four pulsed-field gel electrophoresis (PFGE) patterns comprising the outbreak strain. The outbreak strain comprised four PFGE pattern combinations: GX6A16·0408/GX6A12·0096 (pattern 1), GX6A16·0268/GX6A12·2297 (pattern 2), GX6A16·0068/ GX6A12·0096 (pattern 3), and GX6A16·1618/GX6A12·2384 (pattern 4). All four PFGE patterns were indistinguishable by MLVA.
