William Hart @willhart96 · Nov 23, 2020, Nov 23, 2020, 7:01 PM New pre-print now online: high infectiousness immediately before COVID-19 symptom onset highlights the importance of contact tracing medrxiv.org/content/10.110… @WCMBlog www.medrxiv.org High infectiousness immediately before COVID-19 symptom onset highlights the importance of contact... Understanding changes in infectiousness during COVID-19 infections is critical to assess the effectiveness of public health measures such as contact tracing. Data from known source-recipient pairs...