Will Stone

A COVID-19 vaccine for children younger than 12 is not yet available, but research is well underway and the first shot for some kids in this age group is expected in the fall, doctors say.

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.

The FDA amended its emergency use authorizations for the Pfizer and Moderna vaccines to allow for an additional dose for some immunocompromised people.

Alabama is one of the states throwing away COVID-19 doses as they expire. But other nations desperately need vaccines — and public health experts would like to see vaccines used instead of wasted.

The 110 million doses sent abroad puts the U.S. ahead of every other country making donations combined. But global health experts warn that billions of donated doses are needed to stop the pandemic.

Even with much of the world in desperate need of COVID-19 vaccines, health officials in the U.S. say millions of doses could soon expire and sending those shots overseas isn't so simple.

They have to figure out how to distribute the vaccines — and keep their citizens interested in getting their jab — without knowing when supplies will arrive.

The U.S. and its allies are starting to send about 1 billion doses to Latin America, Africa and Asia. Workers on the ground say there are still big obstacles to making sure vaccines don't go to waste.

The Biden Administration has asked the World Health Organization to push China harder for answers about what started COVID-19. But some experts say increased public pressure on China may backfire.

In the wake of heated debate over the unproven lab leak theory, the world is calling on China to cooperate with investigations. But efforts to delve into this matter seem to be stalling.

On the first European trip of his presidency, Biden will announce a major U.S. contribution to the global vaccine effort — part of an effort to end COVID-19 "everywhere."

The latest news about donated vaccines and cash aid for low-resource countries seems encouraging. But here's what vaccine experts are saying about supply and demand.

A recent movie produced by Robert F. Kennedy Jr.'s anti-vaccine group tries to capitalize on the COVID-19 pandemic, the racial justice movement and renewed interest in the history of medical racism.

Until recently, plants from only one U.S. facility were approved for use in research. Adding new suppliers will accelerate understanding of cannabis' health effects and possible therapeutic uses.

Loss of smell has become one of the defining symptoms of COVID-19. Scientists have ideas why, but aren't sure how to reverse the damage. Some are trying what's called 'olfactory training.'

Many Americans are still making sense of new CDC guidance that vaccinated people no longer have to wear masks in most indoor settings.

The new CDC guidance on masks is being met with different reactions in Washington, which — despite being cautious — is now dealing with a fourth wave of coronavirus.

Washington Gov. Jay Inslee is extending mandates and restrictions while much of the U.S. celebrates declining COVID-19 case numbers and hospitalizations.

While much of the U.S. celebrates declining COVID-19 case numbers and hospitalizations, the opposite is true in Washington state, where the governor is extending mandates and restrictions.

With older adults vaccinated, doctors say a growing share of their COVID-19 patients are in their 20s, 30s, 40s and 50s, as more contagious variants circulate among people who are still unvaccinated.