TABLE 2.

Distribution of S. aureus strains (n = 1220) in the four phylogenetic branches

AFLP cluster (clonal complex)No. of strains (%) per AFLP cluster
NetherlandsaUnited States (MSSA)United States (MRSA)Total
I367 (44.3)140 (45.6)76 (90.5)b583 (47.8)
II (CC30)216 (26.1)95 (30.9)2 (2.4)c313 (25.7)
III (CC45)176 (21.2)d40 (13.0)d1 (1.2)e217 (17.8)
IV70 (8.4)32 (10.4)5 (6.0)107 (8.8)
Total829 (100)307 (100)84 (100)1,220 (100)
  • a All Dutch strains were MSSA.

  • b Proportionally, more of the MRSA strains in the U.S. cohort than of all the strains in the Dutch cohort (Fisher's exact test; P < 0.0001) or of the MSSA strains in the U.S. cohort (Fisher's exact test; P < 0.0001) were distributed into cluster I.

  • c Proportionally, fewer of the MRSA strains in the U.S. cohort than of all the strains in the Dutch cohort (Fisher's exact test; P < 0.0001) or of the MSSA strains in the U.S. cohort (Fisher's exact test; P < 0.0001) were distributed into cluster II.

  • d Proportionally, more of the carriage strains in the Dutch cohort than of the MSSA strains in the U.S. cohort (Fisher's exact test; P = 0.0016) were distributed into cluster III.

  • e Proportionally, fewer of the MRSA strains in the U.S. cohort than of all the strains in the Dutch cohort (Fisher's exact test; P < 0.0001) or of the MSSA strains in the U.S. cohort (Fisher's exact test; P = 0.0005) were distributed into cluster III.