It’s not just the cold, it’s the humidity.

Winter in the northern United States will soon drive even the most diehard outdoor diners and backyard socializers indoors, bringing with them heightened risk for contracting and spreading Covid-19. The worry is not just that people might mingle more closely inside, but that the air they breathe will make the virus more dangerous. 

Cold, dry air facilitates the spread of the coronavirus, and the social distancing that helped outside won’t be as effective indoors, scientists said.

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“I do worry about this pandemic potentially getting worse this winter,” Akiko Iwasaki, an immunologist at the Yale School of Medicine, told STAT. “All the same kind of concerns that usually apply to other respiratory infections are the same with this

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