IL17A and COVID-19: The main effector cytokines of Th17 are proteins of the IL-17 family (primarily IL-17A), regulating functions of neutrophils and their attraction to the focus of inflammation, and IL-22, the main function of which is the activation of the protective functions of the cells of the epithelial layers, moreover, precisely IL-17A [86] and IL-22 [87] may play an important role in the pathogenesis of COVID-19 and be considered as targets for the treatment of this disease.