CXCL8 and COVID-19: The level of the chemoattractant IL-8 was generally increased in the examined COVID-19 patients at diagnosis (males, 16.3 ± 7.8 pg/mL, females, 19.7 ± 7.5 pg/mL) and decreased in the post-COVID-19 female patients (p < 0.01, Figure 1F).