Cefiderocol vs Best Available Therapy for Carbapenem-resistant Acinetobacter Baumannii-calcoaceticus Complex Infections: A Target Trial Emulation

Inclusion Criteria: * Hospitalized adults (≥ 18 years of age) * Carbapenem resistant A. baumannii-calcoaceticus complex clinical culture * Antimicrobial agent with possible in vitro activity against carbapenem resistant A. baumannii-calcoaceticus complex initiated in the time frame of 2 days before culture collection until 2 days following first available antibiotic susceptibility test result being made available Exclusion Criteria: * Patients with no antibiotic susceptibility testing * Patients with only A. baumannii infection diagnosed by rapid diagnostic tests (i.e., multiplex polymerase chain reaction) * Initiation of antimicrobial agent outside of selected time frame (i.e., 2 days before culture collection until 2 days after first available antibiotic susceptibility test result was made available)