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Phylogeny and outbreak clusters inferred by WGST. Different lineages (I, II, III, IV, and V) are labeled. A total of 16 outbreak clusters (A through P) are identified and labeled. Bootstrapping values of branches leading to individual outbreak clusters are labeled. The designations of three isolates from sporadic cases (2012K-0619, 2012K-0738, and 2012K-0597) are underlined.
