Table 2.
Antimicrobial susceptibility of 62 misID streptococci
| Antimicrobial compound | S (%) | I (%) | R (%) | MIC50 (mg/L) | MIC90 (mg/L) |
|---|---|---|---|---|---|
| Penicillin | 34 (54.8) | 22 (35.5) | 6 (9.7) | 0.25 | 2 |
| Amoxicillin | 44 (71.0) | 12 (19.3) | 6 (9.7) | 0.125 | 2 |
| Ceftriaxone | 54 (87.1) | – | 8 (12.9) | 0.125 | 1 |
| Erythromycin | 32 (51.6) | 1 (1.6) | 29 (46.8) | ≤ 0.25 | > 256 |
| Clindamycin | 47 (75.8) | – | 15 (24.2) | ≤ 0.25 | 128 |
| Telithomycin | 62 (100) | – | – | ≤ 0.004 | 0.06 |
| Tetracycline | 31 (50.0) | – | 31 (50.0) | 4 | 64 |
| Chloramphenicol | 60 (96.8) | – | 2 (3.2) | 2 | 4 |
| Ciprofloxacin | 43 (69.3) | 19 (30.6)* | 2 | 4 | |
| Levofloxacin | 59 (95.2) | – | 3 (4.8) | 1 | 2 |
| Rifampicin | 62 (100) | – | – | ≤ 0.008 | 0.06 |
| Linezolid | 62 (100) | – | – | 0.5 | 1 |
| Vancomycin | 62 (100) | – | – | 0.25 | 0.5 |
| Trimethoprim-sulfamethoxazole | 41 (66.1) | 12 (19.3) | 9 (14.5) | 0.5/9.5 | 4/76 |
S, susceptible; I, intermediate; R, resistant; % of isolates provided in brackets
*Nonsusceptible (MIC ≥ 4 mg/L)