Peptococcusniger has been associated with anaerobic infections including intra-abdominal sepsis reported susceptibilities include penicillin and clindamycin
Reference - Petrini, B., Welin-Berger, T., Nord, C.E. (1979). Anaerobic bacteria in late infections following orthopedic surgery. Med. Microbiol. Immunol. (Berl). 167, 155-159.