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The efficacy of cefoxitin, a perioperative parenteral antibiotic, combined with mechanical bowel preparation and oral antibiotics to prevent wound infections and other septic complications in patients undergoing elective colorectal operations, was examined in a prospective randomized study. All 197 patients who completed the study received mechanical bowel preparation and oral neomycin/erythromycin base. In addition a perioperative parenteral antibiotic was given in three divided doses to 101 patients. The other 96 patients received no parenteral antibiotics. The overall incidence of intra-abdominal septic complications was 7.3% (7 of 96) in the control group (no cefoxitin) and 5% (5 of 101) in the treatment group (cefoxitin). This difference was not statistically significant. The incidence of abdominal wound infection was 14.6% in the control group and 5% in the treatment group, a statistically significant difference (p = 0.02). The addition of perioperative parenteral cefoxitin greatly reduced the incidence of wound infections in patients undergoing elective colorectal operations who had been prepared with mechanical bowel cleansing and oral antimicrobial agents.