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The WHO says people should wear masks only if they are showing COVID-19 symptoms or taking care of someone with the disease.
The study noted that in contrast with China, wearing of face masks was unpopular in most of the Western world during the early outbreak of the pandemic. But the researchers said the evidence shows masks work to slow spread.
Wearing a face mask during the pandemic saves lives. And it may save the economy, too, according to Goldman Sachs.
