Bypass graft infection and bacteremia caused by Anaerostipes caccae: First report of human infection caused by a recently described gut anaerobe

We report a case of bypass graft infection and bacteremia caused by Anaerostipes caccae. A review of the literature shows no reported human infection caused by this microorganism to date. The patient was initially treated with vancomycin and piperacillin-tazobactam on admission and with amoxicillin-clavulanate upon discharge. The slow-growing organism was subsequently found to be susceptible to metronidazole and ertapenem. •First report of human infection caused by Anaerostipes caccae.•Anaerostipes caccae is an obligate anaerobe that was first described in 2002.•The organism is catalase and oxidase negative, non-spore-forming and rod-shaped.•Gram stain of wound and blood cultures showed pleomorphic, gram positive rods.•Antimicrobial susceptibility results can guide therapy for future infections.