This is a historic day, an historic day for science and for all of us.

It took just 248 days to get from the day we announced our plans to collaborate with

Biontech to our FDA submission day.

Albert Borla is CEO of Pfizer and he's talking about their vaccine for COVID-19, which was

developed in just 248 days, eight months.

For context before the pandemic, an FDA approved vaccine in eight years would have been considered

speedy.

But even more exciting than its speed is the new technology this vaccine is using, which

has never gotten this far before in human trials.

It's called mRNA.

And today we're going to take a closer look at the groundbreaking approach of these types

of vaccines.

I'm Dr. Sanjay Gupta, CNN's Chief Medical Correspondent.

And this is coronavirus, fact versus fiction.

There are many different platforms.

Of course, being tested, we have your protein vaccines, we have the mRNA, the DNA vaccines,

the viral vector vaccines.

And so each of them might have different properties we don't know until we've done the trials

and seen the data.

That's Dr. Sam Yeswami Nothin, the Chief Scientist of the World Health Organization.

Now as Dr. Swami Nothin said, there are several different types of vaccines that are being

developed right now for COVID-19.

...