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Comparison of the levels of SIgA levels (A), cytokine levels of interferon (IFN)-α (B), IFN-β (C), IFN-γ (D), interleukin (IL)-12p70 (E), IL-6 (F), IL-17 (G), IL-10 (H), and IL-37 (I) between negative, other viruses and mild B, mild A and severe COVID-19 groups. Values are presented in median and with respective quartile. Statistical analysis: Kruskal–Wallis with Dunn post hoc test level of significance was established at 5% (*p < 0.05; **p < 0.01; ***p < 0.001).
