Morganella morganii is a gram-negative, facultative anaerobic rod that is associated with urinary tract infections and wound infections.
Urinary tract infections: Morganella morganii can cause UTIs, especially in elderly or catheterized patients. It is often resistant to multiple antibiotics and has intrinsic resistance to certain β-lactams. Although it is not a leading cause of UTIs, its presence in polymicrobial and healthcare-associated infections justifies its inclusion in diagnostic testing (Liu et al. 2016, Zhu et al. 2025) .
Wound infections: Morganella morganii is part of the Enterobacterales family and an uncommon but documented cause of wound infections. It has been implicated in serious skin and soft tissue infections like necrotizing fasciitis and is often described in postoperative or trauma-related wound infections. M. morganii has intrinsic resistance to certain antibiotics and can be mistaken as a contaminant if not properly identified. (Kakurai et al. 2025).
Liu H, Zhu J, Hu Q, Rao X. Morganella morganii, a non-negligent opportunistic pathogen. Int J Infect Dis. 2016 Sep;50:10-7. doi: 10.1016/j.ijid.2016.07.006. Epub 2016 Jul 12. PMID: 27421818.
Zhu W, Liu Q, Liu J, Wang Y, Shen H, Wei M, Pu J, Gu L, Yang J. Genomic epidemiology and antimicrobial resistance of Morganella clinical isolates between 2016 and 2023. Front Cell Infect Microbiol. 2025 Jan 31;14:1464736. doi: 10.3389/fcimb.2024.1464736. PMID: 39958990; PMCID: PMC11826060.
Armbruster, C. E., Brauer, A. L., Humby, M. S., Shao, J., & Chakraborty, S. (2021). Prospective assessment of catheter-associated bacteriuria clinical presentation, epidemiology, and colonization dynamics in nursing home residents. JCI insight, 6(19), e144775.
Kakurai, M., Takeyama, S., & Moriyama, Y. (2025). Necrotizing Soft Tissue Infections Caused by Morganella morganii: A Case Report and Review of the Literature. Cureus, 17(3), e80718.
