TABLE 2.
Frequency of resistant cells in individual colonies of C. lusitaniae 7227 derivatives
| Isolatea | Sourceb | RIc (mean ± SD) | No. of colonies |
|---|---|---|---|
| 7227R6 | −AmB | 0.8 ± 0.5 | 10 |
| 7227R6 | +AmB | 1.1 ± 0.7 | 7 |
| 7227SR5 | −AmB | 1.2 ± 0.4 | 9 |
| 7227SR5 | +AmB | 0.9 ± 0.5 | 7 |
| 7227S11 | −AmB | 0.02 ± 0.06 | 21 |
| 7227S11 | +AmB | 0.15 ± 0.4 | 18 |
| 7227RS9 | −AmB | 0.009 ± 0.02 | 18 |
| 7227RS9 | +AmB | 0.06 ± 0.06 | 15 |
a
7227 derivative names are explained in the legend to Fig. 1.
b
Individual colonies were sampled from SAB agar plates with or without 0.15 μg of AmB/ml (+ or −AmB, respectively).
c
The resistant cell index (RI) is defined as the ratio of cells per single colony capable of forming colonies on AmB plates to the total viable cells in that colony.