The first report of a PIA-independent mechanism of biofilm formation in staphylococci identified Bap.89 This 239-kDa sortase-anchored surface protein contributes to the initial attachment and accumulation phases of biofilm.90 Unlike Bap in S. aureus, which is associated primarily with bovine mastitis isolates, Bap in S. epidermidis is commonly found in mastitis isolates from several veterinary species.90 Bap consists of several repeated domains, referred to as Bap repeats, which are responsible for its adhesive properties and the formation of cell-to-cell interactions within the biofilm. The gene discussed is RICTOR; the disease is mastitis.