The authors suggest that loud speech in a closed room (“stagnant airflow”) will produce droplets that can linger as long as 8-14 minutes. This could be one of the reasons for substantial spread of COVID-19, esp combined with asymptomatic or presymptomatic shedding.
It also supports signs in many parks (esp here in NY State) telling us to use the park for exercise/dog walking, not stopping & chatting. Yes it’s outdoors but just speaking loudly is riskier than many of us prob realized.
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