Patient description: The patient is a 57-year-old man with abdominal pain and vomiting. The pain started gradually about 20 hours ago in the epigastric and periumbilical regions, radiating to his back. He drinks around 60 units of alcohol per week and smokes 22 cigarettes per day. He is healthy with no history of allergies or using any medications. His family history is positive for type 2 diabetes (his father and sister). He lives alone and has no children. The abdomen is tender and soft. His bowel sounds are normal. His heart rate is 115/min and blood pressure 110/75 mmHg. The lab results are remarkable for leukocytosis (19.5), urea of 8.5, high CRP (145), high amylase (1200) and Glc level of 15. Cross-sectional imaging was negative for obstructive pancreatitis.

Clinical trial eligibility criteria: eligible ages (years): 18.0-999.0,  Infection Hospitalized men or women >/=18 years of age Expected duration of treatment with intravenous antibiotics anticipated to be >/= 5 full days but not exceeding 14 days Ability to provide documented and signed written informed consent Confirmed or suspected intra abdominal infection defined as follows For a confirmed intra abdominal infection, a surgical procedure (laparotomy or laparoscopy) must have been performed within 24 hours prior to enrollment and reveal at least one of the following Gross peritoneal inflammation with purulent exudates (i.e. peritonitis) Intra abdominal abscess Macroscopic intestinal perforation with localized or diffuse peritonitis Subjects enrolled on the basis of a suspected intra abdominal infection must have Radiological evidence [abdominal plain films, computed tomography (CT), magnetic resonance imaging (MRI) or ultrasound] of gastrointestinal perforation or intra-abdominal abscess and the following signs and symptoms  Known hypersensitivity to quinolones, and/or to carbapenems and/or to any other type of beta lactam antibiotic drugs (e.g. penicillins or cephalosporins), or any of the excipients Women who are pregnant or lactating or in whom pregnancy cannot be excluded History of tendon disease/disorder related to quinolone treatment Known congenital or documented acquired QT prolongation; uncorrected hypokalemia; clinically relevant bradycardia; clinically relevant heart failure with reduced left ventricular ejection fraction; previous history of symptomatic arrhythmias Concomitant use of any of the following drugs, reported to increase the QT interval: antiarrhythmics class IA (e.g. quinidine, hydroquinidine, disopyramide) or antiarrhythmics class III (e.g., amiodarone, sotalol, dofetilide, ibutilide), neuroleptics (e.g. phenothiazines, pimozide, sertindole, haloperidol, sultopride), tricyclic antidepressive agents, certain antimicrobials (sparfloxacin, erythromycin IV, pentamidine, antimalarials, particularly halofantrine), certain antihistaminics (terfenadine, astemizole, mizolastine), and others (cisapride, vincamine IV, bepridil, diphemanil) Known severe end stage liver disease Creatinine clearance </= 30 mL/min/1.73 m2 Systemic antibacterial therapy administered for more than 24 hours within 7 days of enrollment Need for systemic antibacterial therapy with agents other than those described in the study protocol Indwelling peritoneal catheter