Just about everyone is focused on the progress scientists are making to develop

COVID-19 vaccines. It's no secret. A vaccine could help put the pandemic behind us.

So far, there are about two dozen COVID-19 vaccines currently in clinical

trials throughout the world. And just last week, there were some positive news

about a few of those trials. Though I have to caution, it's still too early to say

whether any of these vaccines will actually be effective at preventing

people from getting infected. And that's the most important thing that matters.

But once we actually develop a vaccine, a new question will arise.

How long would our immune system protect us once we are vaccinated?

So today's episode is devoted to answering that question.

We're going to take you through some of the most interesting science on vaccines

and how our immune system responds. I'm Dr. Sanjay Gupta,

CNN's Chief Medical Correspondent. And this is coronavirus, fact versus fiction.

To answer this question, I'm going to pass it over to a frequent guest on this show,

Aaron Bromidge. Aaron is a biology professor at the University of Massachusetts Dartmouth

and a CNN contributor with a weekly column on the latest research related to the pandemic.

Thanks, Sanjay. So I wrote this essay for CNN because one of the things I've been looking at

over the last six or eight months of this outbreak is how our body actually defends

ourselves from this infection. And right from the very start, when the first study started coming

out about antibody mediated protection, I wasn't feeling so great about the data that was emerging.

One of the very first publications that came out on what it looked like in the blood of a person

that had recovered was released in early April. And it showed that people that were infected with

...