Booster vs. third dose: What's the difference, and which do you need?

But what exactly is a booster vaccine?

Is it different from a third or extra shot?

Does the meaning change if we’re talking about a booster instead of a third dose?

Here’s what we know.

Read more:COVID-19 booster shot timing still in flux for most.

A booster shot, according to the VA, is for people whose immune response likely weakened over time.

“Some of this is semantics,” Panettieri says.

That’s what will dictate your eligibility to get another shot when one is available to you.