SMN1 and viral infectious disease: The critical and readily measurable indices reflecting the essence of AIH are a lack of evidence of current viral infection, transferases greater than twice upper normal limit, and immunoglobulin G greater than 1.1 times upper normal limit, interface hepatitis with plasma cell prominence, and positivity to an acceptable titer for SMA, ANA, anti-SLA/LP, or anti-LKM [1].