FIG 5.

Serum concentrations of IL-6 are lower among COVID-19 survivors and similar between indeterminate and acceptable IFN-γ control COVID-19 patients. (A) Serum IL-6 concentrations measured for COVID-19 patients near collection time for IFN-γ production. (B) These same IL-6 levels were compared between COVID-19 patients who succumbed to disease versus patients who survived the course of disease. (C) Serum IL-6 concentrations measured near the time of collection for IFN-γ production that were >100 pg/ml for COVID-19 survivors versus nonsurvivors. Comparison of differences in continuous variables within these groups were performed using the independent unpaired t test or the Welch’s t test, as appropriate, where a difference in means was considered significant if the P value was less than 0.05. *, P < 0.05.