Clostridioides difficile co-infection in patients with COVID-19.

Aim: To assess the impact of Clostridioides difficile infection on the course of COVID-19. Methods: The authors included 809 patients with COVID-19 in this retrospective study: 55 had C. difficile infection, 23 had C. difficile -negative antibiotic-associated diarrhea and 731 had no diarrhea. C. difficile in feces was determined by immunochromatographic test for its toxins. Results: C. difficile infection was associated with increased risk of death (hazard ratio = 2.6; p = 0.021), especially after 20 days of disease (hazard ratio = 6.5; p < 0.001). C. difficile infection-associated diarrhea was longer and more severe than C. difficile -negative antibiotic-associated diarrhea. Unlike patients with C. difficile -negative antibiotic-associated diarrhea, patients with C. difficile infection were admitted to the intensive care unit and needed mechanical ventilation more often than those without diarrhea. Conclusion: C. difficile infection worsens the course and prognosis of COVID-19.