Research note Hae-Sun Chung1,2*, Chorong Hahm1,3*, Miae Lee1,2 1Department of Laboratory Medicine, Ewha Womans University College of Medicine, Seoul, 2Ewha Education and Research Center for Infection, Ewha Womans University Medical Center, Seoul, 3Department of Laboratory Medicine, Eone Laboratories, Incheon, Korea *These authors contributed equally to this work. Corresponding to Miae Lee, E-mail: miae@ewha.ac.kr Ann Clin Microbiol 2023;26(2):29-36. https://doi.org/10.5145/ACM.2023.26.2.1Received on 4 May 2023, Revised on 19 May 2023, Accepted on 31 May 2023, Published on 20 June 2023.Copyright © Korean Society of Clinical Microbiology.This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (https://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract Acinetobacter baumannii is an important cause of healthcare-associated infections and is resistant to almost all antimicrobial agents, with strains recently reported to be resistant to colsitin. In this study, we aimed