Table 2. MRSA isolates from invasive sites by healthcare-related risk factors (HRFs) and PFGE type, Active Bacterial Core Surveillance, January 2004–February 2006*.
| PFGE type | Healthcare associated, no. (%) | Healthcare associated, community onset, no. (%) | Community associated,† no. (%) | Total, no. (%) |
|---|---|---|---|---|
| USA100 | 20 (69) | 30 (68) | 5 (19) | 55 (55) |
| USA200 | 1 (3) | 0 | 0 | 1 (1) |
| USA300 | 8 (28) | 6 (14) | 18 (67) | 32 (32) |
| USA400 | 0 | 1 (2) | 0 | 1 (1) |
| USA500 | 0 | 5 (11) | 2 (7) | 7 (7) |
| USA1000 | 0 | 1 (2) | 1 (4) | 2 (2) |
| Unique type | 0 | 1 (2) | 0 | 1 (1) |
| Not typeable | 0 | 0 | 1 (4) | 1 (1) |
| Total | 29 (100) | 44 (100) | 27 (100) | 100 (100) |
*MRSA, methicillin-resistant Staphylococcus aureus; PFGE, pulsed-field gel electrophoresis. †Patients with community-associated infections were those who did not have HRFs.