IL6 and congestive heart failure: Therefore, we analyzed a large sample of inpatients with confirmed SARS-CoV-2 infection (n = 4,711) from the Dryad database to assess whether blood levels of inflammatory biomarkers—white blood cell (WBC) count, IL-6, ferritin, C-reactive protein, and procalcitonin—on admission serve as independent predictors of in-hospital mortality risk among CHF and non-CHF patients.