It was a surprise even for a family of lawyers. A process called "subrogation" began with a Nevada family's health insurer denying their claim for an ER visit after their 9-year-old fell off his bike.

Operation Warp Speed is allocating the first batch of 6.4 million COVID vaccines to states, based on population. This circumvents a CDC advisory committee, which proposed allocation based on risk.

"Relationships with animals are simple," notes one researcher. In a year when life feels fraught, pets have been healers, helping human companions get exercise, quell anxiety and make new friends.

When Kansas issued a mask mandate, 81 counties opted out. Researchers found coronavirus infection rates rose sharply in the opt-out counties, while falling in those that required masks.

In 2015, the mosquito-borne virus Zika exploded in South America. Health experts predicted it would erupt in Africa. But a major outbreak never happened. Now scientists think they understand why.

And what about those outdoor tents that gyms and spin studios are setting up? Is it safe to exercise in there, too?

With COVID-19 cases surging and more than 250,000 dead, the CDC is recommending people not travel for Thanksgiving. And doctors worry the holiday could be a superspreader event.

The drugs only need to be taken a few times a year — and may soon be available in many parts of the world. Patients say they are more convenient and less stigmatizing.

As the U.S. prepares for what will likely be the largest vaccination program in its history, the Trump administration plans to loan $590 million to a Connecticut company with a novel technology.

More than half of labs are reporting they're running short on test kits, pipettes and crucial chemicals.

People who get more deep sleep appear less likely to develop Alzheimer's. That may be because this phase of sleep allows the brain to clear out waste products.

It's been months of the pandemic and you might be feeling frustrated or upset. But there are lots of different ways to deal with your worries — like giving yourself a big hug!

Young adults are preparing to travel home for Thanksgiving, but the coronavirus is making things complicated. Epidemiologists say there are things families can to do reduce the risk of infection.

A zine and comic guide on how kids can protect themselves from COVID-19. Wear a mask. Stay 6 feet apart. And try not to pick your nose.

Hospitals, a powerful political force in health care, fear lowering the eligibility age for Medicare will cost them billions of dollars because federal reimbursements are less than private insurance.