A cluster of Achromobacter xylosoxidans led to identification of Pseudomonas aeruginosa and Serratia marcescens contamination at a long-term-care facility

Am J Infect Control. 2021 Oct;49(10):1331-1333. doi: 10.1016/j.ajic.2021.04.004. Epub 2021 Apr 19.


A cluster of Achromobacter xylosoxidans, an emerging multidrug-resistant aquaphilic bacterium, was identified in 3 long-term-care facility residents. As Pseudomonas aeruginosa and Serratia marcescens were also present in clinical specimens, we conducted an investigation of all 3 water-associated species and identified P. aerguniosa and S. marcescens contamination at the facility. Sequencing analysis linked P. aeruginosa to a clinical isolate. Findings highlight the need for precautionary measures to prevent transmission of water-associated multidrug-resistant bacteria in long-term-care facilities.

Keywords: Multidrug-resistant bacteria.

MeSH terms

  • Achromobacter denitrificans* / genetics
  • Anti-Bacterial Agents / pharmacology
  • Drug Resistance, Multiple, Bacterial
  • Humans
  • Pseudomonas aeruginosa* / genetics
  • Serratia marcescens / genetics


  • Anti-Bacterial Agents