Safety and Tolerability of Ceftazidime-Avibactam for Pediatric Patients With Suspected or Confirmed Infections

Inclusion Criteria: 1. Written informed consent will be obtained from parent(s) or other legally acceptable representative(s), and informed assent from patient (if age appropriate) will be obtained 2. Male or female children ages ≥3 months to \<18 years. 3. Hospitalized, receiving systemic antibiotic therapy for the treatment of a suspected or confirmed infection, and expected to require hospitalization until after the end of treatment (EOT) evaluations are completed. 4. If female and has reached menarche, or has reached Tanner stage 3 breast development (even if not having reached menarche), the patient is practicing appropriate birth control or is sexually abstinent. 5. Likely to survive the current illness or hospitalization. 6. Sufficient intravascular access (peripheral or central) to receive study drug. Exclusion Criteria: 1. History of hypersensitivity reactions to carbapenems, cephalosporins, penicillin, other β-lactam antibiotics. 2. If female, currently pregnant or breast feeding or has a positive serum β-human chorionic gonadotropin (β-hCG) pregnancy test. 3. Receipt of a blood or blood component (e.g., red blood cells, fresh frozen plasma, platelets) transfusion during the 24-hour period before enrolment. 4. BMI outside the range (below the 5th percentile or above the 85th percentile) for height, age, and weight except for children \<2 years of age. 5. Babies born prior to 37 weeks gestation (cohort 4 only).