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Welcome to Prognosis. I'm Laura Carlson. It's day 51 since coronavirus was declared a global

pandemic. Our main story, researchers and scientists are moving at unprecedented speed to add to what we

know about the pandemic.

That speed is warranted because understanding the virus is the only way to eventually contain it.

But it's also leading to confusion and challenging the public's faith in science.

But first, here's what happened today.

There are many unanswered questions about coronavirus. One of them, how long will all this last, now has a possible answer.

A group of experts say the pandemic is likely to be with us for as long as two years.

A report from the Center for Infectious Disease Research and Policy at the University of Minnesota says the fact that people without symptoms can spread

the virus makes it harder to control than the flu. And people may be at their most infectious

before any symptoms appear. After locking down billions of people around the world to minimize COVID-19 spread,

governments are now cautiously allowing businesses and public places to reopen.

Yet the report predicts the coronavirus pandemic is likely to continue in waves that could last beyond 20-22.

We'll need about two-thirds of the world's population to become immune before we can control

the virus, the authors said. And about that immunity. One way to get it is through a vaccine,

which is still a long way off. Another is by having

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