People with weakened immune systems who already got two doses of the Pfizer or Moderna COVID-19 vaccines can now get a third shot. But exactly who is eligible? Here's what we know so far.

As the delta variant takes over in the U.S., new, localized outbreaks are emerging. Those surges are likely driven by pockets of dangerously low vaccination rates.

Can I get a massage? Travel with my unvaccinated kids? Eat indoors at a restaurant? Hit the gym? Experts weigh in with advice on 16 frequently asked post-vaccination questions.

President-Elect Joe Biden shares details of how his administration hopes to tackle the country's public health crisis. It's an aggressive plan that he needs Congress to fund.

Many favorite holiday traditions could be treacherous this year because of the coronavirus. Here's how experts view the risks — and some creative, safer alternatives to keep up a festive mood.

An independent federal advisory committee to the CDC recommends the Pfizer-BioNTech vaccine for people over 16. But state health leaders say distribution and funding challenges remain.

The President's diagnosis calls for contact tracing on a massive scale. Luckily, not everyone President Trump saw this week with is a high risk exposure. Here's who is.

If you want to socialize with family or friends — say share a vacation cabin — can testing in advance keep everyone safe? We asked experts how diagnostic tests work and how to interpret the results.

As schools weigh the risks of reopening, many are making plans to lower the risks of coronavirus transmission. Here's how to vet your school's proposals.

As coronavirus cases surge in many states, a new color-coding tool backed by a coalition of top scientists provides an apples-to-apples way of comparing outbreak severity, down to the county level.

The weather is warming up and public spaces are starting to reopen. How do you decide what's safe to do? We have guidance to help you compare and evaluate the risks.

New estimates say the U.S. needs to triple its testing. But how much testing does each state need? Here's how states compare to each other, and to targets experts say they should hit.

The preliminary results showed that hospitalized patients who received remdesivir recovered 31% faster. Dr. Anthony Fauci hailed the findings as "quite good news."

There are rumblings that U.S. health officials may start encouraging Americans to wear face masks to cut down on asymptomatic spread. But with continued shortages, it's not clear how we'd do that.

Federal agencies are working furiously to find out what is causing people to sicken and are warning consumers not to vape.

Calling it "the most inspiring thing" he's ever seen, SpaceX's CEO talked up his company's big innovation and plans to fast-track production of the spacecraft. He hopes to fly passengers by next year.

With hundreds of unexplained cases of vaping-related illness, and the sharp rise in youth vaping, the Trump administration is acting to crack down on kid-friendly vape flavors.

President Trump has signed an executive order pushing for sweeping changes in the way kidney disease is treated.

The World Health Organization has updated its handbook of diseases to include an expanded definition of burnout. It closely links it to workplace stress and says it can lead to reduced productivity.

A federal agency issued a proposed rule Friday that rolls back Obama-era protections for transgender patients. Advocates for transgender people say the rule leaves them vulnerable to discrimination.