TABLE 1.
MICs of four antibiotics for 579 GCS isolates and 911 GGS isolates
| Organisms (no. of isolates tested) | Antimicrobial agent | MIC (μg/ml)a
|
% Resistantb | ||
|---|---|---|---|---|---|
| 50% | 90% | Range | |||
| GCS (579) | Erythromycin | 0.064 | 0.125 | 0.064–64 | 3.6 |
| Clindamycin | 0.064 | 0.125 | 0.032–2 | 1.0 | |
| Tetracycline | 0.5 | 16 | 0.032–64 | 13 | |
| Penicillin G | 0.008 | 0.032 | 0.008–0.5 | 0 | |
| GGS (911) | Erythromycin | 0.064 | 0.064 | 0.064–>64 | 3.5 |
| Clindamycin | 0.064 | 0.125 | 0.032–>64 | 0.3 | |
| Tetracycline | 2 | 64 | 0.125–>64 | 43 | |
| Penicillin G | 0.016 | 0.016 | 0.008–0.5 | 0 | |
a
50% and 90%, MICs at which 50 and 90% of the isolates are inhibited.
b
Breakpoints according to the National Committee for Clinical Laboratory Standards.