Transmission of COVID-19 by asymptomatic cases

11 June 2020 - Global research on COVID-19 continues to be conducted, including how the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is transmitted. Current evidence suggests that most transmission occurs from symptomatic people through close contact with others. Accordingly, most recommendations by WHO on personal protective measures (such as use of masks and physical distancing) are based on controlling transmission from symptomatic patients, including patients with mild symptoms who are not easy to identify early on.