Investigation and control of a suspected outbreak of carbapenem-resistant Acinetobacter baumannii nosocomial infections in the cardiovascular surgical ICU based on whole-genome sequencing

The CRAB infections in this department did not constitute a nosocomial infection outbreak; however, attention should be directed toward clonal transmission driven by mobile genetic elements. The urine bag drainage valve switch is identified as a potential transmission risk point that warrants special attention. It is imperative to enhance nosocomial infection prevention and control measures, including environmental disinfection, hand hygiene, and patient isolation.