• Daniel A Hofmaenner, Pedro David Wendel Garcia, Branko Duvnjak, Bhavya Chakrakodi, Julian D Maier, Michael Huber, Jon Huder, Aline Wolfensberger, Peter W Schreiber, Reto A Schuepbach, Annelies S Zinkernagel, Philipp K Buehler, Silvio D Brugger, and COVID-19 ICU-Research Group Zurich.
• Institute of Intensive Care, University Hospital Zurich, Raemistrasse 100, CH-8091, Zurich, Switzerland.
• Antimicrob Resist Infect Control. 2021 Jan 12; 10 (1): 11.

BackgroundIn intensive care units (ICUs) treating patients with Coronavirus disease 2019 (COVID-19) invasive ventilation poses a high risk for aerosol and droplet formation. Surface contamination of severe acute respiratory syndrome Coronavirus 2 (SARS-CoV-2) or bacteria can result in nosocomial transmission.MethodsTwo tertiary care COVID-19 intensive care units treating 53 patients for 870 patient days were sampled after terminal cleaning and preparation for regular use to treat non-COVID-19 patients.ResultsA total of 176 swabs were sampled of defined locations covering both ICUs. No SARS-CoV-2 ribonucleic acid (RNA) was detected. Gram-negative bacterial contamination was mainly linked to sinks and siphons. Skin flora was isolated from most swabbed areas and Enterococcus faecium was detected on two keyboards.ConclusionsAfter basic cleaning with standard disinfection measures no remaining SARS-CoV-2 RNA was detected. Bacterial contamination was low and mainly localised in sinks and siphons.

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