Abstract

Periprosthetic joint infection (PJI) is a serious complication following joint prosthesis implantation. Although Streptococcus dysgalactiae subsp. equisimilis is increasingly recognized as an emerging human pathogen, Streptococcus dysgalactiae subsp. dysgalactiae (SDSD) is traditionally considered an animal-associated organism. However, recent reports indicate that SDSD can infrequently cause invasive human infections. SDSD has been linked to PJIs, endocarditis, and cellulitis of the upper and lower extremities. To date, only two cases of SDSD-related PJI have been described in the literature. Here, we present a rare case of late-onset PJI caused by SDSD following knee arthroplasty.