Towards an accurate and systematic characterisation of persistently asymptomatic infection with #SARS-CoV-2 - The Lancet Infectious Diseases
▻https://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30837-9/abstract
Two systematic reviews that only included studies with sufficient time to exclude pre-symptomatic infection have estimated the proportion of SARS-CoV-2 infections that remain completely free of symptoms to be 20% (95% CI 17–25%)7 and 17% (95% CI 14–20%).8 The individual studies included in these reviews rarely estimated an asymptomatic fraction greater than 50%. The range of estimates of asymptomatic SARS-CoV-2 infection reported in studies that used a wider variety of study designs goes from as low as 4% to more than 80% (table).9