Enlarge / Asian woman with protective face mask using smartphone while commuting in the urban bridge in city against crowd of peopled3sign via Getty Images
On March 28, 2020, as COVID-19 cases began to shut down public life in much of the United States, then-Surgeon General Jerome Adams issued an advisory on Twitter: The general public should not wear masks. “There is scant or conflicting evidence they benefit individual wearers in a meaningful way,” he wrote.
Adams’ advice was in line with messages from other US officials and the World Health Organization. Days later, though, US public health leaders shifted
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