STAT1 and viral encephalitis: Together with our previous observation of a delayed IFN response (Fig. 4i), the mice with T403 phosphorylation deficiency failed to release U-STAT1 and U-STAT2 from the inactive anti-parallel conformation to facilitate a rapid antiviral response, which makes them vulnerable to viral encephalitis with an overactive immune response and an intractable cytokine storm.