Susceptibility testing of clinically relevant anaerobes including confirmation of unusual resistance phenotypes is performed via agar dilution (AD). A panel of antimicrobials is routinely tested which includes ceftriaxone, co-amoxiclav, clindamycin, meropenem, metronidazole, piperacillin-tazobactam, penicillin, vancomycin, doxycycline and rifampicin. Testing for other antimicrobials is available on request. Anaerobes not suitable for AD will be tested by gradient strip (GS)