Patients 1 and 2 cultured multiresistant P. aeruginosa with identical antibiograms. Patients 3 and 4 cultured multisusceptible P. aeruginosa and Serratia marcescens. Patient 4 also had Stenotrophomonas maltophilia. Bronchoscope cultures taken after manual re-processing grew P. aeruginosa, S. marcescens and S. maltophilia with identical antibiograms to Patient 4. Procedure review revealed multiple irregularities including reduction of immersion time in sterilant from 30 to 10 minutes. This change had been adopted at the vendors’ suggestion due to concerns regarding damage to the bronchoscope from exposure to chemical sterilants. In liaison with the Infection Control team, SICU staff devised a new workflow ensuring re-processing of bronchoscopes in an automated washer-sanitiser occurred following use, with sterility checks on the bronchoscope following cleaning.