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Elevated serum inflammatory cytokines in severe COVID-19 patients. Serum levels of IL-6, IFNγ, IL-17A, IL-10 (upper panels), IL-4, IL-2, TNFα and CXCL13 (lower panels) in OTD-CoV-2neg subjects (nOTD), OTD-CoV-2pos subjects (pOTD) and severe COVID-19 patients. Statistical comparisons between the three groups of subjects were assessed by the non-parametric Kruskal-Wallis test followed by Dunn’s multiple comparisons.**p < 0.01; ***p < 0.001; ****p < 0.0001.
