The new guidance, published only on Friday, had acknowledged that fine particles floating in air may spread the virus.
Experts said the memo would make it more difficult for the F.D.A. to issue new rules, but it’s unclear how it would affect the vetting of coronavirus vaccines.
A controversial guideline saying people without Covid-19 symptoms didn’t need to get tested for the virus came from H.H.S. officials and skipped the C.D.C.’s scientific review process.
The practice of taking temperatures is becoming de rigueur in many workplaces and restaurants, even though federal health officials say they are of limited value.
The agency told public health agencies that two unidentified vaccines might be ready by October or November. We explain how vaccine trials work, when one might be ready, and who may get them first.
A federal agency is resurrecting a version of Predict, a scientific network that for a decade watched for new pathogens dangerous to humans. Joe Biden has also vowed to fund the effort.
Most antibody tests are useful only for large population surveys, diagnosis in certain children or when initial diagnostic testing fails, according to an expert panel.
Pharmacists may now vaccinate young children under a new federal emergency rule aimed at helping families who missed well-child visits during the pandemic.
There’s no vaccine for Covid-19, but there’s one for influenza. With the season’s first doses now shipping, officials are struggling over how to get people to take it.
In March and April, death rates rivaled those seen during the country’s deadliest pandemic, a new study finds. “What 1918 looked like is basically this.”