TABLE 3.
Summary of PFGE strain types involved in interhospital dissemination
| Strain type | No. of isolates | No. of isolates with the following band differences
|
No. of hospitals | CHARa | Yr(s) cultured | ||
|---|---|---|---|---|---|---|---|
| 0 bands | 1–3 bands | 4–6 bands | |||||
| M2 | 11 | 6 | 3 | 2 | 2 | 1 | 1991–1992 |
| M1 | 135 | 57 | 66 | 12 | 13 | 1 | 1993–1996 |
| M7 | 6 | 0 | 5 | 1 | 5 | 1 | 1994–1995 |
| M3 | 70 | 30 | 20 | 20 | 10 | 1, 4, 11 | 1994–1996 |
| M4 | 23 | 11 | 6 | 6 | 3 | 1 | 1995–1996 |
| M6 | 6 | 2 | 3 | 1 | 3 | 1 | 1995–1996 |
| M19 | 6 | 2 | 0 | 4 | 4 | 1 | 1995–1996 |
| M10 | 15 | 7 | 4 | 4 | 2 | 1 | 1995–1996 |
| M11 | 13 | 4 | 3 | 6 | 4 | 1, 4 | 1996 |
| M12 | 2 | 0 | 0 | 2 | 2 | 1 | 1996 |
| M14 | 3 | 3 | 0 | 0 | 3 | 1 | 1996 |
| M22 | 2 | 0 | 0 | 2 | 2 | 1, 8 | 1996 |
| M23 | 6 | 2 | 4 | 0 | 4 | 1, 2, 8 | 1996 |
| M25 | 4 | 3 | 1 | 0 | 2 | 1 | 1996 |
| M27 | 2 | 0 | 2 | 0 | 2 | 1, 4 | 1996 |
a
See Fig. 1 for CHAR designations.