Almost everybody walking around, if you were to test their blood right now, they would have some levels of antibody to the four different coronaviruses that are known.

Ann Falsey

The vaccines are all standing up pretty well -- Pfizer, Moderna and Johnson Johnson -- for severe disease, now, that's not to say that we might not eventually get to a point where we really need people to get boosters to prevent more severe illness. But, really, the majority of the breakthrough infections are colds, maybe flu-like illness -- not the scary illnesses that we were facing before. So my main message is, don't panic. You're going to be okay.

But there's a lot of reasons people don't want to get sick. They don't want to pass it to loved ones. People don't want to pass it to young children that can't get vaccinated yet.

They just don't need to storm the pharmacies and panic.

Probably it's going to be true of any of the vaccines, not just Pfizer -- we'll benefit from boosting immunity. That's not the same thing as saying it's critically necessary.

I think that, depending on your own natural immunity because you feel like you're a strong person is like playing Russian roulette.

I would never depend only on my natural immunity to weather this virus. It's a very, very bad actor.