Canada has had about 2.4 million cases of COVID-19 since December 2020. About 85% of the population has gotten at least one dose of a coronavirus vaccine, while about 82% has gotten two doses.

People who catch COVID may feel as if they won't get it again, at least not for a long time. Their immune system should be primed to fight it off in the future. Right? Well, let's see.

Big Bird, who is technically 6 years old, got his COVID-19 vaccine over the weekend. His announcement did not sit well with conservatives like Sen. Ted Cruz, who called it "government propaganda."

San Francisco's only In-N-Out location still hasn't reopened for indoor dining. The restaurant violated public health requirements by allowing customers to enter without showing proof of vaccination.

More contagious than other variants, and maybe more likely to cause severe disease, Delta is spreading so fast in the U.S. it could cause another surge this summer or fall, according to new research.

Instead of putting genetic instructions into people whose cells then make a viral protein, the vaccines from Novavax, Medicago and Sanofi carry a spike protein payload.

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

After several days of more than peak traffic over the last few weeks, Tybee Island is adding lifeguards and making traffic changes.

White evangelical Christians are one of the most vaccine-hesitant groups in the United States. They're also among the largest religious groups, and their reluctance poses a public health challenge.

A viral TikTok makes vaccine science understandable and pretty funny (it's a horror film parody). NPR caught up with creator and star Vick Krishna — tech expert by day, videographer by night.

The Tuskegee syphilis study is often cited as a reason why Black Americans might hesitate on the COVID-19 vaccine. But many say it's current racism in health care and Tuskegee is used as an excuse.

People who've had dose 1 are wondering ... can I have a few drinks before dose 2 or will that muck things up? Also: Do you really understand the concept of "vaccine efficacy"? It's complicated!

The third COVID-19 vaccine authorized for use in the U.S. requires one shot instead of two, and works a slightly different way from the others. Here's what we know about its safety and effectiveness.

The House Select Subcommittee on the Coronavirus Crisis is investigating after NPR reported that the boutique health care provider allowed ineligible patients to skip the COVID-19 vaccine line.

Concierge health care provider One Medical has been allowing ineligible people to receive COVID-19 vaccines. Staff questioned what they saw as inappropriate, internal documents obtained by NPR show.