EXPLAINER: Is it time to get a COVID-19 booster? Which one?

Virus Outbreak Boosters

Millions more Americans just became eligible for COVID-19 boosters, but figuring out who's eligible and when can be confusing. And adding to the challenge is that this time around, people can choose a different brand of vaccine for that extra dose.

A number of factors, including the vaccine you started with and when your last dose was, help determine when you qualify. Just like the initial shots, boosters are free and will be available at pharmacies, doctors' offices and clinics.

Here are some things to know:

WHY ARE BOOSTERS NEEDED?