{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,2]],"date-time":"2026-07-02T05:37:58Z","timestamp":1782970678655,"version":"3.54.5"},"reference-count":128,"publisher":"MDPI AG","issue":"13","license":[{"start":{"date-parts":[[2026,6,24]],"date-time":"2026-06-24T00:00:00Z","timestamp":1782259200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJMS"],"abstract":"<jats:p>Serratia marcescens has emerged as an important opportunistic pathogen in intensive care units (ICUs), where critically ill patients, invasive devices, antimicrobial exposure, and complex environmental reservoirs create favorable conditions for colonization, infection, and recurrent outbreaks. This narrative review synthesizes evidence from the past decade regarding the clinical and molecular epidemiology, environmental persistence, device-associated transmission, biofilm-mediated resistance, and infection-control strategies of S. marcescens in ICU settings. The literature was reviewed using an integrative approach informed by Ferrari\u2019s narrative review framework, with thematic synthesis across clinical, microbiological, environmental, and genomic domains. Recent evidence indicates that ICU-associated S. marcescens infections frequently involve respiratory tract colonization, ventilator-associated pneumonia, bloodstream infection, urinary tract infection, and device-related transmission. Hospital water systems, sink drains, wet surfaces, ventilator circuits, reusable equipment, and contaminated antiseptic or liquid products may serve as persistent reservoirs, particularly when biofilm formation supports long-term survival and recurrent dissemination. At the molecular level, S. marcescens demonstrates substantial genomic diversity, intrinsic and acquired antimicrobial resistance, inducible AmpC \u03b2-lactamase activity, efflux-mediated tolerance, and plasmid-associated resistance gene transfer. This review particularly emphasizes the molecular determinants that enable S. marcescens to persist in ICU ecosystems, including AmpC-mediated \u03b2-lactam resistance, efflux-associated tolerance, quorum-sensing-regulated biofilm formation, plasmid-mediated horizontal gene transfer, and WGS-defined clonal transmission. Whole-genome sequencing, rapid molecular diagnostics, active surveillance, environmental sampling, and integrated infection-control bundles have become increasingly important for distinguishing clonal outbreaks from endemic transmission and guiding timely interventions. Emerging perspectives emphasize the need to combine antimicrobial stewardship, environmental engineering, respiratory-care auditing, anti-biofilm strategies, and AI-assisted real-time surveillance into adaptive ICU infection-control frameworks. Overall, S. marcescens should be regarded not merely as an episodic outbreak organism, but as a highly adaptable ICU-associated pathogen requiring multidisciplinary prevention strategies.<\/jats:p>","DOI":"10.3390\/ijms27135697","type":"journal-article","created":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T05:48:16Z","timestamp":1782366496000},"page":"5697","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Serratia marcescens in Intensive Care Units: Molecular Epidemiology, Biofilm-Mediated Persistence, Antimicrobial Resistance, and Genomic Surveillance"],"prefix":"10.3390","volume":"27","author":[{"given":"Tao-An","family":"Chen","sequence":"first","affiliation":[{"name":"Division of Respiratory Therapy, Department of Chest Medicine, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya-Ting","family":"Chuang","sequence":"additional","affiliation":[{"name":"Department of Nursing, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hua-Yu","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Nursing, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ya-Fung","family":"Chang","sequence":"additional","affiliation":[{"name":"Department of Nursing, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yu-Ho","family":"Hsieh","sequence":"additional","affiliation":[{"name":"Department of Nursing, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Cheng-Hsien","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Surgery, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang-Sheng","family":"Lin","sequence":"additional","affiliation":[{"name":"Department of Internal Medicine, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi-Jen","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Infectious Diseases, Show Chwan Memorial Hospital, Changhua City 50009, Taiwan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,6,24]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Williams, D.J., Grimont, P.A.D., Cazares, A., Grimont, F., Ageron, E., Pettigrew, K.A., Cazares, D., Njamkepo, E., Weill, F.X., and Heinz, E. 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