Unlike the initial outbreak, the surge in Covid cases is hitting younger adults the hardest.
Wearing a disposable mask beneath a cloth mask or using a mask with multiple fabric layers are among the options.
The shift comes as new Covid-19 cases and hospitalizations decline, even as new variants set off alarms.
Differing guidelines, rules and practices determine how the country’s limited testing supply is allocated.
For Americans with these symptoms, there are few answers available on why they surface.
Many students who return to campuses will experience some form of testing.
The seven-state effort to buy more than 3 million coronavirus antigen tests was born of need and disappointment.
New U.S. virus cases topped 60,000 in a day for the first time Thursday, with the national total above 3.1 million.
Governors have already begun taking divergent approaches, inflaming tensions within states as well as with neighbors.
Covid-19 cases have increased in some reopened states, remained stable in others.
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