TABLE 1.
PFGE band differences among the outbreak strains
| Karyotype | No. of isolates with the following
band differencesa:
|
|||
|---|---|---|---|---|
| 0–1 bands | 2–3 bands | 4–5 bands | 6–7 bands | |
| VRE type I, vanB (+vanA)b | 86 | 13 | 4 | |
| VRE type II, vanAa | 21 | 6 | ||
| VRE type II, vanBb | 3 | 3 | 1 | |
| VSE type II, van negativeb | 11 | 6 | ||
| VRE type II, vanAc | 13 | 5 | 8 | 1 |
| VRE type II, vanBc | 1 | 3 | 3 | |
| VSE type II, van negativecd | 6 | 7 | 3 | |
a
Band differences were compared by comparison with the bands for the most commonly isolated subtype within VRE type I or II.
b
Ten bands (80 to 300 kb) were analyzed.
c
Sixteen bands (45 to 300 kb) were analyzed.
d
One isolate was lost; all VSE isolates were resistant to ampicillin.