Antibiotics covering aerobic and aerobic bacteria should be delivered orally and intravenously prior to colorectal surgery.  Antibiotics delivered within this framework will reduce the risk of postoperative SWI by at least 75%.  Further research is required to establish the optimal timing and duration of dosing, and frequency of longer-term adverse effects such as Clostridium difficile pseudomembranous colitis.
Antibiotic prophylaxis in elective gastro-intestinal tract surgery: a comparison of single-dose pre-operative cefotaxime and multiple-dose cefoxitin.
In a prospective trial conducted at five medical centres, 136 patients aged 18 to 75, undergoing elective gastro-intestinal surgery were randomized to receive a single dose of cefotaxime, 1 g preoperatively, or cefoxitin, 2 g preoperatively followed by 2 g every 6 h for no more than 24 h. Overall infection rates with both regimens were approximately 10%. There were no significant differences in the infection rates between subgroups. Thus, a single preoperative 1 g dose of cefotaxime is as efficacious as, but considerably more cost-effective than, multiple 2 g doses of perioperative cefoxitin in the prevention of infection following elective gastrointestinal tract surgery.