Overexpression of orange spotted grouper (Epinephelus coioides) Mda5 triggered an increase in the expression levels in IFN and IFN-stimulated response element (ISRE) promoter in a dose-dependent manner (400 and 800 ng ml−1) and also enhanced the expression of IRF3, IRF7, and TRAF6 (TNF receptor-associated factor 6) and some pro-inflammatory factors including, tumor necrosis factor (TNF-α), interleukin 6 (IL-6) and IL-8 at different time points during SGIV and RGNNV infection (34). Here, IFIH1 is linked to infection.