Blunt abdominal trauma is associated with a low risk of injury to the
microorganism-containing hollow viscera. Therefore, routine pre-operat
ive administration of antibiotics is not necessary. Antibiotics are gi
ven intraoperatively, if laparotomy discloses transmural injury of a h
ollow organ and peritoneal contamination. If intervention is early (<1
2 hours) and there is no evidence of purulent exudate in the abdominal
cavity, the antibiotic should be considered prophylactic and not exce
ed one dose. Neglected injuries should be treated with antibiotics for
a maximum of 5 days.