Here’s how much coronavirus people infected with COVID-19 may exhale

"Based on the new data, the team estimates that a high shedder could potentially exhale enough virus to infect someone in a closed space in about 20 seconds, making even elevator rides risky. With an average shedder, infection could take a little under 4 minutes."

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Source: https://www.sciencenews.org/article/coronavirus-infected-covid-19-exhale