Critics say the agency has applied scant oversight and negligible penalties despite virus outbreaks at many plants in the spring.

The health agency will license much of its material to the online encyclopedia, allowing the information to be reposted widely into almost 200 languages.

A C.D.C. analysis finds that overall death rates have risen, particularly among young adults and people of color.

Even if people coated the inside of their mouths with a coronavirus-killing chemical, a substantial amount of the virus would still remain in the body.

A Harvard researcher added up the number of years that Americans who died from Covid-19 might have lived had they reached a typical life expectancy.

Running pummels knees more than walking does, but in the process it may fortify and bulk up cartilage, helping stave off knee arthritis.

Mothers who were psychologically distressed during pregnancy had a higher risk of asthma in their offspring.

President Trump’s recent tests are a reminder that although many products exist, none test for infectiousness.

Critics said the study, sponsored by the W.H.O., was too poorly conducted to be definitive.

The Justice Department announced an $8 billion settlement with the company. Members of the Sackler family will pay $225 million in civil penalties but criminal investigations continue.

At the C.D.C., he waged a 13-year campaign to vanquish a deadly infectious disease that had ravaged the world for centuries. Victory came in 1977.

Alabama’s immense resources and a newly developed Southeastern Conference policy paved the way for Saban to return to the field only days after he tested positive for the coronavirus.

As winter approaches, we still need to be vigilant about taking precautions.

In 2016, agency scientists deemed hair straighteners containing formaldehyde to be unsafe, according to newly obtained emails.

Except in areas where Covid is surging, there are still no lines of patients in the hospital halls.

They appear to be a fourth pair of large salivary glands, tucked into the space where the nasal cavity meets the throat.

All the weak points of American health care — testing delays, communication breakdowns, inequity — are working against this potential treatment.

Regulators say a major group is misrepresenting cost-sharing plans, saddling people with unpaid medical bills.

After months of caving to pressures from the White House, Commissioner Stephen Hahn and a band of agency scientists have eked out a few victories.

A manifesto urging reliance on “herd immunity” without lockdowns was warmly received by administration officials. But the strategy cannot stem the pandemic, many experts say.