Does wearing a mask in public help slow the spread of COVID-19? Signs point to yes.

CHICAGO — For weeks, officials from the White House to Chicago’s City Hall told people that wearing a face mask in public isn’t necessary as the novel coronavirus spread — and that it could even cause more harm than good.But other countries took a different route, especially some Asian nations — including South Korea, Hong Kong and Singapore — where mask wearing became common practice. In Europe, the Czech Republic went so far as to require that people wear masks when they venture from their homes. Public health officials in those nations contend that widespread mask use limited the scope of t...

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