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Many studies consider the contamination of dental unit waterlines (DUWLs), but few of them have studied the possible presence of antibiotic resistant  Pseudomonas aeruginosa  in the DUWLs. Investigation of the presence of  P. aeruginosa  and  Pseudomonas  spp. strains in DUWLs and evaluation of their resistance to six antibiotics (ceftazidime, netilmicin, piperacillin/tazobactam, meropenem, levofloxacin, colistin sulfate) at a public dental clinic in Milan, Italy. Dental units were contaminated by  P. aeruginosa  with loads of 2–1,000 CFU/L and were mainly located on the mezzanine floor, with a range of 46–54%, while  Pseudomonas  spp. were primarily found on the first and second floors, ranging from 50 to 91%.  P. aeruginosa  was antibiotic resistant in 30% of the strains tested, and Pseudomonas  spp. in 31.8% . Cold water from controls was also contaminated by these microorganisms. Monitoring antibiotic resistance in the water and adopting disinfection procedures on DUs are suggested within the Water Safety Plan.

Dental unit water content and antibiotic resistance of Pseudomonas aeruginosa and Pseudomonas species: a case study