BackgroundCorynebacterium striatum is increasingly recognized as a multidrug-resistant (MDR) opportunistic pathogen, yet its role in psychiatric hospitals remains poorly characterized. Differentiating colonization from true infection in this setting is clinically challenging.MethodsThirty C. striatum isolates were obtained from psychiatric inpatients with prolonged hospitalization. Antimicrobial susceptibility testing and whole-genome sequencing (WGS) were performed to characterize resistance de