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. 2002 Aug;40(8):3004–3011. doi: 10.1128/JCM.40.8.3004-3011.2002

FIG. 3.

FIG. 3.

PCA. The first three components explain 50% of the observed variation. Each of the three groups formed represents isolates from the three geographical regions studied (MX, GT, and CO). The group formed with isolates from MX includes clinical (C) and environmental (E) isolates.