In addition, in the case of people with a severe course of COVID-19, a greater Th17 response and related interleukin-17 (IL-17), interleukin-21 (IL-21), interleukin-22 (IL-22) and granulocyte-macrophage colony-stimulating factor (GM-CSF) were also noted [76]. Here, IL17A is linked to COVID-19.