So where does the evidence lie? And is there any harm in public health measures that go beyond the science, or if people behave more cautiously than they need?Scientists have learned a lot about Covid-19 since the pandemic began.
"Indoors are much more dangerous because the walls and the ceiling and the floor trap the air," particularly if there's low ventilation, he told AFP. Only one documented outbreak occurred outdoors, in a village in Shangqiu, Henan -- where a 27-year-old man became infected after having a conversation outdoors with a carrier in January 2020.
"I cannot run very far in warmer weather while wearing it. Then if I stop to chat with other people I can put it on. If I go walking with friends, I wear one."Mask wearing became a politicized issue in the United States early on in the pandemic, with some conservatives, spurred by former president Donald Trump, viewing them as an affront to their personal freedom.
"Because masks have become so infused with politics, they have become something where people go around and 'mask shame' other individuals, and I think that's counterproductive," he said.
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