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Baseline circulating levels of cytokines of the whole cohort according to COVID-19 pneumonia severity. Serum levels of (A) resistin, (B) IL-6, (C) IL-8, (D) IL-15, (E) MCP-1 and (F) TNF-α in patients with mild, moderate or severe COVID-19 pneumonia. IL, interleukin; TNF-α, tumor necrosis factor alpha; MCP-1, monocyte chemoattractant protein 1. Data were presented as Median and IQR. * p < 0.05 and ** p < 0.001 were considered statistically significant by Mann–Whitney.
