TABLE 1.
Resistance rates of B. fragilis group isolates by year
| Yr | No. of isolates | No. (%) of isolates resistant per yr
|
|||
|---|---|---|---|---|---|
| Penicillin | Piperacillin | Cefoxitin | Clindamycin | ||
| 1992 | 158 | 155 (98.1) | 33 (20.9) | 42 (26.6) | 13 (8.2) |
| 1993 | 186 | 179 (96.2) | 37 (19.9) | 25 (13.4) | 15 (8.1) |
| 1994 | 124 | 121 (97.6) | 30 (24.2) | 19 (15.3) | 14 (11.3) |
| 1995 | 148 | 144 (97.3) | 35 (23.6) | 23 (15.5) | 12 (8.1) |
| 1996 | 153 | 143 (93.5) | 23 (15.0) | 40 (26.1) | 24 (15.7) |
| 1997 | 142 | 137 (96.5) | 24 (16.9) | 16 (11.3) | 28 (19.7) |
| Total | 911 | 879 (96.5) | 182 (20.0)a | 165 (18.1) | 106 (11.6) |
a
Only 2 of 443 (0.5%) strains from 1995 to 1997 were resistant to piperacillin-tazobactam.