Early serological tests from Denmark showing 3.5% of Copenhagen blood donor sample has COVID-19 antibodies. With 5000 confirmed cases, authorities now believe the true number is 30-80 times higher (150,000-400,000 of total population of 5.6m, 203 dead): https://t.co/U2XAG25yWe

— Rasmus Fonnesbæk (@fonnesbaek) April 8, 2020