TABLE 3.
Percent resistancea of isolates to antibiotics tested by species of the B. fragilis group
| Antibiotic(s) | % Resistance of:
|
|||||
|---|---|---|---|---|---|---|
| B. fragilis | B. distasonis | B. thetaiotaomicron | B. ovatus | B. vulgatus | Otherb | |
| Imipenem | 0.2 | 0 | 0 | 0 | 0 | 0 |
| Meropenem | 0.2 | 0 | 0 | 0 | 0 | 0 |
| Piperacillin-tazobactam | 0 | 0 | 0 | 0 | 0 | 2.0 |
| Ampicillin-sulbactam | 1.0 | 2.3 | 1.5 | 0.9 | 0 | 4.0 |
| Ticarcillin-clavulanate | 0.4 | 0 | 0 | 0 | 0 | 2.0 |
| Piperacillin | 21.3 | 20.5 | 19.9 | 25.7 | 17.0 | 16.0 |
| Ticarcillin | 30.0 | 33.3 | 29.9 | 35.4 | 15.3 | 30.0 |
| Cefoxitin | 4.7 | 13.6 | 5.1 | 14.2 | 1.7 | 8.0 |
| Ceftizoxime | 20.1 | 17.1 | 21.2 | 23.9 | 5.1 | 18.0 |
| Cefotetan | 14.9 | 59.5 | 68.4 | 70.6 | 21.4 | 48.9 |
| Cefmetazole | 5.9 | 39.8 | 44.5 | 54.9 | 8.5 | 30.0 |
| Clindamycin | 13.8 | 11.4 | 20.2 | 20.7 | 26.8 | 16.0 |
| Trovafloxacin | 5.7 | 1.1 | 3.6 | 6.2 | 13.6 | 6.0 |
| Total no. of strains | 513 | 88 | 137 | 114 | 59 | 50 |
a
Resistance at NCCLS-recommended resistance breakpoints (Table 2).
b
Includes the following: 29 B. uniformis isolates, 18 B. caccae isolates, and 3 B. stercoris isolates.