IL6 and viral infectious disease: It has been reported that IL-6 can effectively ameliorate lung injury caused by influenza virus infection [31], and it is hypothesized that the mRNA expression level of IL-6 is elevated in the pre-infection period, which, on the one hand, ameliorates the damage to the organism caused by viral infection and, on the other hand, strengthens the immune function of the organism and plays a regulatory role in maintaining the immune homeostasis of the organism.