CONGRESS 2023 - Anaerobe update

Antimicrobial resistance (AMR) in anaerobic bacteria varies greatly between institutions and countries. It is crucial that we have robust and widely available methods and perform regular surveillance to raise awareness of AMR amongst laboratory and clinical teams. The UKARU offers a UK-wide service for the identification and antimicrobial susceptibility testing (AST) of anaerobic clinical isolates. Since 2016, this service has included weekly AST by agar dilution. The MIC population distributions for isolates referred are presented in real time via the ARUMIC platform, facilitating continuous monitoring of the development of resistance and valuable data for the review and development of epidemiological cut-offs (ECOFFs) and species-specific breakpoints, alongside the European Committee for Antimicrobial Susceptibility Testing (EUCAST). During 2017 – 2021 EUCAST and the UKARU reviewed the AST methodology and breakpoints for anaerobes and developed a standardised disk diffusion method. Fastidious Anaerobe Agar with horse blood (FAA-HB) was used to test the most commonly isolated anaerobic bacteria including Bacteroides spp (n=170), Prevotella spp. (n=49), Fusobacterium necrophorum (n=51), Clostridium perfringens (n=58) and Cutibacterium acnes(n=54). The antimicrobials included for the initial phase were benzylpenicillin, piperacillin-tazobactam, meropenem, metronidazole and clindamycin with vancomycin included for the Gram positive organisms. Breakpoints for additional agents have just been published on the EUCAST website. This lecture will provide insights into the development of AMR in anaerobic bacteria, the available AST methodologies and the importance of surveillance for this important group of pathogens.

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