Pfizer vaccine

The agreement provides a significant boost to the European Union's goal of getting 70% of adults vaccinated. Currently, around a quarter of the bloc's population is vaccinated.

With the Tokyo Games weeks away, the pharmaceutical company and its German partner, BioNTech, have agreed to donate the necessary doses.

Their physical and emotional health had withered in the pandemic year. But reentry into post-vaccination life made for tricky choices, too.

After getting one dose of the COVID-19 vaccine, some people are having trouble getting their second shot. Here's how to maximize the likelihood you'll get both doses, to be fully immunized.

"We've now purchased enough vaccine supplies to vaccinate all Americans," Biden said on Thursday. "Now we're working to get those vaccines into the arms of millions of people."

The spread of new strains raises new questions as two COVID-19 vaccines continue their rollout across the U.S. and another vaccine candidate preps for regulatory review. Here's what you need to know.

It takes time after vaccination for immunity to the virus to build up, and no vaccine is 100% effective. Plus, scientists don't yet know if the vaccine stops viral spread. Here's what's known so far.

A coronavirus surge is overwhelming hospitals, leading doctors to tell families to care for sick loved ones at home instead. Health workers fear New Year's parties could have led to further spikes.

From France to Germany to The Netherlands, citizens are venting frustration over the pace of the mass vaccination program.

Hours after the EU's drug agency signed off on the vaccine, the European Commission approved its use, clearing the way for inoculations to begin across Europe.