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Dynamic changes of lymphocyte subsets in severe and critical COVID-19. Absolute numbers of total lymphocytes (a), T lymphocytes (b), CD4+ T-cells (c) and CD8+ T-cells (d), B cells (e), NK cells (f) were analyzed at different time points after hospital admission. Data were reported as median and interquartile range (IQR). The dotted line shows the lower limit of normal value of each parameter. *:p < 0.05
