Study to Compare TP-434 and Ertapenem in Community-acquired Complicated Intra-abdominal Infections

Inclusion criteria

• Abdominal pain/discomfort with onset prior to hospitalization
• Evidence of a systemic inflammatory response
• Physical findings consistent with intra-abdominal infection (IAI)
• Clinical diagnosis of community-acquired IAI requiring urgent surgical or percutaneous intervention and not expected to require antibacterial therapy for longer than 14 days
• Body mass index (BMI) of ≤ 30 kilograms per square meter (kg/m^2)
• Able to provide informed consent. If the participant is unable to provide informed consent, the participant's legally acceptable representative may provide written consent in accordance with institutional guidelines
• If female, not pregnant or nursing or, if of child-bearing potential either: will commit to use at least two medically accepted, effective methods of birth control (for example, condom, oral contraceptive, indwelling intrauterine device, hormonal implant/patch, injections, approved cervical ring) during study drug dosing and for 90 days following last study drug dose or practicing sexual abstinence

Exclusion criteria

• Symptoms related to diagnosis of complicated appendicitis (if current diagnosis) for < 24 hours prior to current hospitalization
• Previously hospitalized or admitted to a healthcare facility within the last 6 months
• Managed by Staged Abdominal Repair or other open abdomen technique
• Known at study entry to have an IAI caused by a pathogen(s) resistant to both study drug antibiotics
• Acute Physiology and Chronic Health Evaluation (APACHE) II score > 25
• Unlikely to survive the 6-8 week study period
• Any rapidly-progressing disease or immediately life-threatening illness, including acute hepatic failure, respiratory failure and septic shock
• Requirement for vasopressors at therapeutic dosages
• Renal failure
• Presence or possible signs of hepatic disease
• Hematocrit < 25% or hemoglobin < 8 grams per deciliter (g/dL)
• Neutropenia with absolute neutrophil count < 1000 cells per cubic millimeter (mm^3)
• Platelet count < 50,000/mm3
• Abnormal coagulation tests or participant on anticoagulants
• Immunocompromised condition, including known human immunodeficiency virus (HIV) positivity or acquired immune deficiency syndrome (AIDS), organ (bone marrow) transplant recipients, and hematological malignancy. Immunosuppressive therapy, including use of high-dose corticosteroids (for example, > 40 milligrams [mg] prednisone or equivalent per day for greater than 2 weeks)
• History of hypersensitivity reactions to tetracyclines or carbapenems
• Participation in any investigational drug or device study within 30 days prior to study entry
• Known or suspected central nervous system (CNS) disorder that may predispose to seizures or lower seizure threshold
• Previously received TP-434 in a clinical trial
• More than 24 hours duration of systemic antibiotic coverage for current condition
• Received ertapenem or any other carbapenem, or tigecycline for the current infection
• Need for concomitant systemic antimicrobial agents other than study drug or received systemic (IV or oral) antibiotics in the last 3 months
• Refusal of mechanical ventilation, dialysis or hemofiltration, cardioversion or any other resuscitative measures and drug/fluid therapy at time of consent
• Known or suspected inflammatory bowel disease or associated visceral abscess