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| Bacterium | No. Tested | Pen G | A/C | Mero | Metro | Clinda | Vanco |
| Breakpoint | <1 | <8/4 | <8 | <16 | <4 | <2 | |
| B. fragilis group | 49 | NT* | 98** | 98** | 100 | 47 | NT* |
| Clostridium | 18 | 89*** | 100 | no data | 94 | 50 | no data |
| Gram-pos cocci (Peptostreptococcus, Finegoldia) | 23 | 100 | 100 | no data | NT* | 78 | 100 |
| Pigmented Gram-neg rods (Prevotella, Porphyromonas) | 3 |
NT* | 3^ | no data | 3^ | 2^ | NT* |
| Fusobacterium | 3 | 2^ | 3^ | no data | 3^ | NT | |
| P. acnes | 38 | 100 | no data | no data | NT* | 97** | 100 |
| Veillonella | 8 | 3^ | 8^ | no data | 8^ | 6^ | NT* |
Pen G - Penicillin G, A/C - Amoxicillin/clavulanate, Mero - Meropenem, Metro - Metronidazole, Clinda - Clindamycin, NT - not tested,
* - NT= resistance common to this drug for this bacterium and drug not tested; *** the penicillin MICs of 2 C. tertium isolates was 1 mg/L, and would likely respond to high dosage penicillin therapy.
^ no of isolates rather than % are reported because of low N
**Note that both meropenem and amoxicillin/clavulanate resistance occurs in B. fragilis, though at low frequency. Also note that clindamycin resistance occurs at low frequency in P. acnes. Anaerobic susceptibility testing is available on request, and may be useful in difficult therapeutic circumstances, such as undrained abscesses, drug allergies and intolerance.
updated 2/24/09 P. Edelstein