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Shown are MRSA lineages or clones that are currently predominant in large geographical locations around the world. Most clones belong to clonal complexes 5 (shown in blue) or 8 (shown in red). Other predominant clones belong to CCs 22, 30, and 45. Although spreading globally, pronounced numbers of CA-MRSA infections are only seen in the U.S., where almost all CA-MRSA infections are caused by clone USA300 (CC8, shown in red).
