1. Evidence of a personally signed and dated informed consent document indicating that
the subject's parent(s), legal guardian, or legally acceptable representative has been
informed of all pertinent aspects of the study.
2. Willing and able to comply with scheduled visits, treatment plan, laboratory tests,
and other study procedures.
3. Male or female neonates and infants with age at Screening:
Cohort 1: Full term infants (gestational age ≥ 37 weeks) with chronological age >28 days to
28 days to days). A maximum of 3 pre-term corrected age infants may be enrolled in each part (A and B)
of Cohort 1. Sites will be notified in writing if this limit is reached.
Cohort 2: Full term neonates (gestational age ≥ 37 weeks) from birth to ≤ 28 days.
Cohort 3: Pre-term neonates (gestational age ≥ 26 to
Corrected age = Subtract the number of weeks born before 40 weeks of gestation from the
Inclusion Criteria for Part A Subjects Only:
1. Hospitalized and receiving intravenous antibacterial therapy for the treatment of a
suspected or confirmed bacterial infection.
Inclusion Criteria for Part B Subjects Only:
1. Hospitalized with suspected or confirmed aerobic Gram-negative bacterial infection
requiring intravenous antibacterial therapy.
2. Subjects must meet at least 1 clinical and 1 laboratory criterion or meet at least 2
of the clinical criteria:
1. Hypothermia (38.5ºC);
2. Bradycardia OR tachycardia OR rhythm instability;
3. Urine output 0.5 to 1 mL/kg/h OR hypotension OR mottled skin OR impaired peripheral
4. Petechial rash OR sclerema neonatorum;
5. New onset or worsening of apnea episodes OR tachypnea episodes OR increased oxygen
requirements OR requirement for ventilation support;
6. Feeding intolerance OR poor suckling OR abdominal distension;
1. White blood cell count ≤ 4.0 × 10^9/L OR ≥ 20.0 × 10^9/L;
2. Immature to total neutrophil ratio >0.2;
3. Platelet count ≤ 100 × 10^9/L;
4. C reactive protein (CRP) >15 mg/L OR procalcitonin ≥ 2 ng/mL;
5. Hyperglycemia OR Hypoglycemia;
6. Metabolic acidosis.
1. Investigator site staff members directly involved in the conduct of the study and
their family members, site staff members otherwise supervised by the Investigator, or
subjects who are Pfizer employees, including their family members, directly involved
in the conduct of the study.
2. Participation in another clinical study involving investigational drug(s) within 30
days prior to study entry and/or during this study participation or have previously
participated in the current study or in another study of CAZ-AVI (in which an active
agent was received).
3. Use of potent inhibitors of organic anion transporters OAT1 and/or OAT3 (eg,
probenecid, p-aminohippuric acid (PAH), or teriflunomide) are prohibited. This
prohibition of OAT1 and/or OAT3 inhibitors also applies to the mothers of any neonates
or infants who are breast feeding during the trial.
4. Other acute or chronic medical or laboratory abnormality that may increase the risk
associated with study participation or investigational product administration or may
interfere with the interpretation of study results and, in the judgment of the
Investigator, would make the subject inappropriate for entry into this study.
5. Documented history of any hypersensitivity or allergic reaction to any beta-lactam
6. Refractory septic shock within 24 hours before screening that does not resolve after
60 minutes of vasopressor therapy.
7. Moderate or severe renal impairment defined as serum creatinine ? 2 times the upper
limit of normal (ULN) for age OR urine output hours) OR requirement for dialysis. Deterioration of renal function after enrollment
during Part B of the study will be handled on a case-by-case basis in discussion with
the Medical Monitor.
8. Evidence of progressively fatal underlying disease, or life expectancy of ? 60 days.
9. Documented history of seizure.
10. Active acute viral hepatitis or acute hepatic failure.
11. Known Clostridium difficile associated diarrhea.
12. Requiring or currently taking antiretroviral therapy for human immunodeficiency virus
(HIV) or known HIV positive mother.
13. Any condition (eg, cystic fibrosis, urea cycle disorders), antepartum/peripartum
factors, or procedures that would, in the opinion of the Investigator, make the
subject unsuitable for the study, place a subject at risk, or compromise the quality
14. Treatment with ceftazidime within 12 hours of CAZ-AVI administration.
Exclusion Criteria for Part A Subjects Only:
1. Subject received a blood or a blood component transfusion within 24 hours of the start
of CAZ AVI infusion.
2. Subject is expected to be discharged less than 24 hours after the start of CAZ AVI
Exclusion Criteria for Part B Subjects Only:
1. At study entry, subject has confirmed or strongly suspected infection with a pathogen
known to be resistant to CAZ-AVI or only a Gram-positive pathogen or viral, fungal, or
parasitic pathogens as the sole cause of infection.
2. Confirmed or suspected central nervous system (CNS) infection (eg, meningitis, brain
abscess, subdural abscess).
3. Anticipated need for antibacterial therapy longer than 14 days (eg, osteomyelitis,
endocarditis). This applies to both study treatment with CAZ-AVI as well as adjunctive
IV antibacterial treatment for suspected co infection with Gram-positive organisms or
multi drug resistant Gram-negative organisms.
4. Receipt of more than 24 hours of nonstudy systemic antibacterial treatment for
Gram-negative organisms after culture and before administration of study doses of
CAZ-AVI. Empiric coverage with an aminoglycoside for suspected multidrug resistant
organisms is permitted, provided CAZ-AVI is initiated within 24 hours after culture.
5. Intravenous treatment with chloramphenicol within 24 hours of administration of study
doses of CAZ-AVI.
6. Subject is expected to be discharged less than 48 hours after the start of CAZ-AVI