Broad-spectrum antibiotics administered to patients with severe COVID-19 pneumonia pose a risk of infection caused by Clostridioides difficile. This risk is reduced mainly by strict hygiene measures and early de-escalation of antibiotic therapy. Recently, oral vancomycin prophylaxis (OVP) has also been discussed. This retrospective study aimed to assess the prevalence of C. difficile in critical COVID-19 patients staying in an intensive care unit of a tertiary hospital department of anesthesiology, resuscitation, and intensive care from November 2020 to May 2021 and the rates of vancomycin-resistant enterococci (VRE) after the introduction of OVP and to compare the data with those from controls in the pre-pandemic period (November 2018 to May 2019). During the COVID-19 pandemic, there was a significant increase in toxigenic C. difficile rates to 12.4% of patients, as compared with 1.6% in controls. The peak rates were noted in February 2021 (25% of patients), immediately followed by initiation of OVP, changes to hygiene precautions, and more rapid de-escalation of antibiotic therapy. Subsequently, toxigenic C. difficile detection rates started to fall. There was a nonsignificant increase in VRE detected in non-gastrointestinal tract samples to 8.9% in the COVID-19 group, as compared to 5.3% in the control group. Molecular analysis confirmed mainly clonal spread of VRE.

Department of Anesthesiology Resuscitation and Intensive Care University Hospital Olomouc 1 P Pavlova 6 779 00 Olomouc Czech Republic

Department of Medical Biophysics Faculty of Medicine and Dentistry Palacky University Olomouc Hnevotinska 3 779 00 Olomouc Czech Republic

Department of Microbiology Faculty of Medicine and Dentistry Palacky University Olomouc Hnevotinska 3 779 00 Olomouc Czech Republic

Department of Microbiology University Hospital Olomouc 1 P Pavlova 6 779 00 Olomouc Czech Republic

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