BackgroundInfections by carbapenem‐resistant Pseudomonas aeruginosa (CRPA) have been associated with high morbidity and mortality among solid organ recipients.ObjectivesTo delineate the epidemiological and molecular characteristics of a recurrent outbreak of imipenem (IMP)‐producing P. aeruginosa (CRPA) among kidney transplant (KT) recipientMethodsWe described a recurring CRPA outbreak in a KT ward, divided into two periods: before unit closure (Feb 2019–2020) and after reopening (Aug 2020–Dec 2023). Routine surveillance cultures (SCs) were performed using axillary‐perineum‐rectal swabs with immunochromatographic tests. A case‐control study identified risk factors for CRPA acquisition. Pulsed‐field gel electrophoresis and whole genome sequencing characterized the strains.ResultsAfter reopening, new cases arose from patients previously colonized, peaking 18 months later. A total of 67 KT recipients with CRPA‐IMP‐producing strains were identified. All except one sequenced strain belonged to the ST446 clone, differing by a maximum of 110 single nucleotide polymorphisms. Forty‐five (67.2%) cases were identified through SC, with 45.7% showing intermittent SC positivity. Patients remained colonized for up to 623 days. Twenty‐four (35.8%) patients had infections, with the most common site being the urinary tract. Identified risk factors included older age, deceased donor, re‐transplantation, reoperation, carbapenem or quinolone use, lymphopenia, hospital stay >10 days, and the first 60 days post‐KT.ConclusionKT recipients can harbor CRPA for extended periods, and detecting CRPA‐colonized patients is challenging. These characteristics highlight the patient as the major source and a critical point in outbreak control.
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