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Comparison of peripheral innate and adaptive immune cells of severe COVID-19 adult patients (Severe.Ad) with critical COVID-19 adult patients (Critical.Ad). (A) Total T-lymphocytes (CD3+). (B) CD4+/CD8+ ratio, (C) Cytotoxic T cells (CD3+, CD8+). (D) T helper (CD3+, CD4+). (E) B lymphocytes (CD19+). (F) NK cells (C16+, CD56+). (G) Monocyte (CD14+). *p < 0.05; **p < 0.01; ***p < 0.001; NS, not significant.
