Temporal Dynamics in Viral Shedding and Transmissibility of COVID-19

May 1, 2020

This study, by Xi He et al, published in Nature Medicine (15 April, 2020), reports that 44% of secondary COVID-19 cases were transmitted by people who had not yet developed symptoms. The findings emphasize that control measures should be adjusted to account for probable substantial presymptomatic transmission. Sensitive and specific molecular and serological testing is very useful in this regard.