Susceptibility to acute infection (viral)-induced encephalitis-11 (IIAE11) is an autosomal recessive disorder characterized by increased susceptibility to viral encephalitis with neurotropic viruses, such as herpes simplex virus-1 (HSV-1), influenza B virus (IBV), or norovirus (NV), beginning in the first decade of life. The brainstem is specifically affected, suggesting a defect in tissue-specific and cell-intrinsic immunity. The disease is often fatal (summary by Zhang et al., 2018). For a discussion of genetic heterogeneity of susceptibility to acute infection (viral)-induced encephalitis or encephalopathy, see 610551.