WASHINGTON - As of July’s high temperatures rage across the South and Southwest, so are case numbers — the country topped 50,000 new cases Wednesday, a record high for a single day. These cases are largely the product of higher temperatures. The hotter weather has driven people indoors to cool off. However, the congregation of people in places with poor air circulation provides opportunities for the virus to spread quickly.

“We know from contact tracing that very, very little transmission occurs outside. You have dilution, and the virus is not that stable outside. Indoors is the problem — touching surfaces, and also being in close proximity and rebreathing the air that people have just exhaled without dilution,” Professor of Medicine at Harvard Medical School, Edward Nardell said.

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