Population structure of S. aureus isolates based on MLVA. Each circle represents a different MLVA profile. Three clusters (C1, C2, and C3) were identified as shown by the three colors (blue, green, and pink). Heavy lines connecting two MTs denote a single-locus variant, thin lines denote MTs with a double-locus variant, and dotted lines connect MTs that differ by more than two loci.