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Phylogenomic relationships of S. aureus isolates. Molecular epidemiology of (a) all S. aureus isolates and (b) ST188 S. aureus isolates. Relationships are shown with respect to the draft genome of ST188 strain CUHK_HK188. The scale bars are expressed in changes per site in both panels. STs of select clades are indicated in (a), in bold. MSSA strains are indicated by a black star; the remaining strains are MRSA. MSSA strain A217 has recently been assigned MLST type ST226.
