TABLE 1.

S. aureus isolates tested for arcA

No. of isolates testeda (yr isolated)PFGE typeSCCmec typeCC:STNo. (%) arcA positive
82 (2001-2005)USA300IVaCC8:ST882 (100)
7 (2001-2002, 2005)USA300IVbCC8:ST80 (0)
1 (2005)USA300IVcCC8:ST80 (0)
2 (2005)USA300IVmiscCC8:ST80 (0)
22 (2000-2005)USA300Absent (MSSA)CC8:ST82 (9.1)
46 (2000, 2004-2005)USA100IICC5:ST56 (13.0)b
1 (2005)USA200IICC30-39:ST360 (0)
12 (1998, 2004-2005)USA400IVaCC1:ST10 (0)
4 (1995-1996, 1999)USA500IVaCC8:ST80 (0)
1 (1999)USA600IICC45:ST450 (0)
3 (2001, 2004, 2005)USA700IVaCC72:ST720 (0)
10 (2000-2001, 2004-2005)USA800IVCC5:ST50 (0)
1 (1996)USA900Absent (MSSA)CC150 (0)
3 (1994, 2005)USA1000IVCC59:ST590 (0)
1 (1999)USA1100IVCC30:ST300 (0)
10 (1995-1997, 2001, 2003)ST80cIVaCC80:ST800 (0)
8 (1989, 1993-1994)IberianICC8:ST2470 (0)
  • a The geographic origins of the isolates were as follows: USA300 IVa, Arizona, California, Colorado, Georgia, Louisiana, Missouri, Mississippi, Nebraska, Nevada, New Mexico, Oregon, Pennsylvania, Tennessee, and Texas; USA300 IVb, Georgia, Louisiana, Mississippi, and Tennessee; USA300 IVc, New York; USA300 IVmisc, New York; USA300 MSSA, Alaska, California, Louisiana, Minnesota, Missouri, Nevada, New Mexico, and Pennsylvania; USA100, Nebraska, Ohio, and California; USA200, United Kingdom; USA400, Nebraska and Minnesota; USA500, Colorado, Connecticut, and Vermont; USA600, New York; USA700, Nebraska and Mississippi; USA800, Nebraska; USA900, New Mexico; USA1000, California, Louisiana, and Vermont; USA1100, Alaska; ST80, Denmark; Iberian, Italy, Portugal, Scotland, and Spain.

  • b Based on the PFGE profiles of the arcA-positive USA100 isolates from Nebraska, three additional arcA-positive USA100 strains from California were identified in the CDC collection.

  • c European community-associated strain.