Figure 4. Principal component cluster analysis (PCA) of 41 MRSA (R1–R41) and two MSSA (S42, S43) of CC5.

(A) Clustering of the 43 CC5 isolates by PCA as well as (B) subclustering of 30 MRSA CC5 cluster I isolates using a higher resolution PCA plot for in-depth identification of additional subgroups (Ia–Id).