Background: Previous studies have identified patients infected with Mycobacterium chimaera (M. chimaera) subsequent to cardiac surgery. Water tanks in heater-cooler units (HCUs) used cardiac heart surgery was traced as source. The aim was to investigate occurrence of M. chimaera and other microorganisms in HCUs and evaluate the silver-ion cleaning routine.
Method: Five HCUs were disinfected with silver-ions and examined for mycobacteria directly (15 min) after the disinfection procedures and later on three occasions (3, 6, 10 weeks). One HCU was selected for additional investigation of the presence of other microorganisms. In addition, tap water from five sinks in the surgical department was examined for the presence of mycobacteria and other microorganisms.
Results: M. chimaera grew in all the HCU water tanks and in 35 of the 40 HCU samples. Three of the samples also contained Mycobacterium gordonae. When the selected HCU tanks were analysed directly after the disinfection procedure bacteria and fungi were found but no non-fermenting Gram-negative rods. These HCU samples contained a doubled to 3 fold amount of bacteria compared to initial tap water samples. No mycobacteria were found in any sample from the five water taps.
Conclusion: The silver-ion cleaning routine was insufficient and M. chimaera was found in all HCUs. However, no mycobacteria were found in any sample from the five water taps suggesting another source of colonization. It is probable that residual water and biofilm are of importance. Our results emphasize the need for improved disinfection procedures and improved construction of the HCUs.
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http://dx.doi.org/10.1080/23744235.2018.1464204 | DOI Listing |
J Clin Microbiol
December 2024
Laboratoire de Bactériologie, CHU Bordeaux, Bordeaux, France.
Accurate identification of non-tuberculous mycobacterial (NTM) species is crucial for the diagnosis and appropriate management of NTM infections. This study aimed to evaluate the performance of two assays, FluoroType Mycobacteria VER 1.0 and Maldi BioTyper (MBT) Mycobacteria.
View Article and Find Full Text PDFJ Hosp Infect
October 2024
Department of Public Health and Pediatrics, University of Turin, Turin, Italy.
Front Public Health
October 2024
Department of Biomedical Sciences Laboratory, Affiliated Dongyang Hospital of Wenzhou Medical University, Dongyang, Zhejiang, China.
Pathogens
September 2024
Department of Health Sciences, University of Genova, Via Pastore 1, 16132 Genova, Italy.
Monaldi Arch Chest Dis
September 2024
Department of Medicine and Surgery, Respiratory Diseases, University of Insubria, Varese, Como; Respiratory Rehabilitation Unit, Istituti Clinici Scientifici Maugeri, IRCCS, Pavia.
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