Who is eligible? Can you mix and match? The latest on booster shots.
Answering that question may depend a lot on new variants.
Volunteers in the UK will soon be deliberately infected with the coronavirus, and experts are divided over it. Here's why.
FAQs about the largest mass-vaccination campaign in US history.
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Flu season is coming and COVID isn't leaving. Widespread flu vaccination can help us handle dueling viruses. Will we rise to the occasion?
We're not out of the woods yet. Here's a primer on why the contagious virus is back and what might happen next.
The virus is on the rise in people under 50.
Everything you need to know about flu vaccination, and then some.