T.E.A. Study Three Days Ertapenem Versus Three Days Ampicillin- Sulbactam

Inclusion Criteria: Adult patients ( \> 18 years) requiring surgical intervention within 24 hours of diagnosis, for localized IAI infections (i.e extending beyond the organ wall but confined near the hollow viscus, mild to moderate in severity): * Acute appendicitis: Ruptured or perforated with abscess * Acute diverticulitis with perforation and/or abscess * Acute cholecystitis (including gangrenous) with either rupture or perforation * Acute gastric and duodenal ( \> 24 hours) perforation * Traumatic (\> 12 hours) perforation of the intestines * Secondary peritonitis due to perforated viscus * Intra-abdominal abscess (including of liver and spleen) Exclusion Criteria: * Traumatic bowel perforation requiring surgery within 12 hours * Perforation of gastroduodenal ulcers requiring surgery within 24 hours * other intra-abdominal processes in which the primary etiology was unlikely to be infectious. * Patients lactating or pregnant * Patients with a history of allergy, hypersensitivity, or any severe reaction to the study antibiotics * Patients with rapidly progressive or terminal illness; * Patients with a history or presence of severe hepatic or renal disease (e.g. creatinine clearance \< 0.5 ml/min/1.73 m2); * Patients with a concomitant infection that would interfere with evaluation of response to the study antibiotics.