The recruitment will last for approximately 6 months or until recruitment target is met, and information about treatment will be collected from the patients' medical records. Patients will be followed from CAZ AVI initiation until death, withdraw of the study, 60 days after discharged from the hospitalization, whichever comes first. The endpoint events will be evaluated at: 7 days, 14 days, 21 days, 30 days, 60 days, and end of treatment (EOT) after CAZ AVI initiation, if patients are not discharged prior to the next upcoming timepoint; and 30 days, 60 days after discharge.
This observational study will enroll approximately 450 in patients. Patients treated with CAZ AVI for at least 1 dose at around 20 research centers in China will be enroll.