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Welcome to Prognosis. I'm Laura Carlson. It's day 49 since coronavirus was declared a global

pandemic. Our main story? Immunity has come up a lot recently, as governments consider weather and how

to reopen. Some have floated immunity passports

that would allow people who have successfully fought off the virus

to go back into society.

Trouble is, that assumes an understanding of coronavirus we still don't have.

Whether having the virus makes you immune to future infections, and if so, for how long, is still unclear.

So who's really immune? But first, here's what happened today.

The U.S. recession has officially begun.

After 11 years of record growth, the economy shrank at a 4.8% annualized rate in the first quarter.

With the coronavirus forcing businesses to close and consumers to stay home

around the country, it's likely to be the deepest recession in at least 80 years. That's right,

80 years. The current quarter is expected to be far worse.

Bloomberg Economics projects an annualized contraction of a staggering 37%. The Trump administration has launched a project to fast-track a coronavirus vaccine.

The goal is to make enough doses for most Americans by the end of the year.

The program, called Operation Warp Speed, will pull together private pharmaceutical companies,

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