The Proportion of SARS-CoV-2 Infections That Are Asymptomatic
Review (highest-quality evidence from English [n = 365 104] and Spanish [n = 61 075] serosurveys) suggests one third of infections are asymptomatic. Longitudinal studies suggest three quarters of positive PCR test asymptomatic cases at time of testing will remain asymptomatic.
Source:
Annals of Internal Medicine