CXCL8 and COVID-19: The serum IL-8 levels were elevated in ICU, severe, and nonsurvivor COVID-19 patients compared to non-ICU, nonsevere, and survivor patients (WMD = 42.55, 95% CI: 8.09-77.01, and P = 0.02; WMD = 11.72, 95% CI: 6.41-17.02, and P < 0.01; WMD = 23.61, 95% CI: 15.61-31.60, and P < 0.01) (Figures 7(a)–7(c)).