I have a question about the masks.

Here's how you can make your own base covering in a few easy steps.

There is growing evidence that masks are effective.

Our second episode ever, which if you can believe it, aired just a month ago, was all about

masks.

On March 3rd, we told you that if you appear to be healthy, you probably don't need

to be wearing a mask.

At that time, that was the advice from the World Health Organization and the Centers for

Disease Control and Prevention.

The CDC has now issued new guidance, recommending that even people who are not displaying symptoms

of COVID-19 should cover their faces in public when they cannot maintain social distancing

in places like grocery stores and pharmacies.

The change was announced by President Trump at a briefing on Friday.

And we want to make sure you know why and have the latest information about keeping

yourself and others safe.

I'm Dr. Sanjay Gupta, CNN's Chief Medical Correspondent, and this is coronavirus, fact,

versus fiction.

Part of what inspired the CDC's new guidance on masks is a letter by a panel of prestigious

scientists that warned COVID-19 may be spread through talking or even breathing, not just

coughing or sneezing.

In some ways, we've known this for a long time.

It is the essence of asymptomatic spreading without symptoms.

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