Moxifloxacin Plus Metronidazole Versus Piperacillin/Tazobactam for the Treatment of Patients With Intra-abdominal Abscesses

Antibiotic therapy for patients with intra-abdominal abscesses; Intervention consists of antibiotic treatment of the patients with intraabdominal abscess with either the combination of Moxifloxacin and Metronidazole or Piperacillin/Tazobactam.1. Moxifloxacin 400 mg, administered intravenously once daily in combination with Metronidazole 500 mg, administered two times daily intravenously, followed by an oral medication with Moxifloxacin 400 mg once daily and Metronidazole 500 mg twice daily. 2. Piperacillin / Tazobactam 4,5 g administered intravenously three times daily.