IFNA2 and infection: Neutralising auto-Abs at high concentrations of IFN-α and/or IFN-ω are present in 0.18% of individuals between 18 and 69 years, 1.1% between 70 and 79 years and 3.4% >80 years, and in all individuals with a severe disease course but in none of the tested individuals with asymptomatic or paucisymptomatic infections.