(Meredith/CNN) -- As of Valentine's Day, more than 64,000 coronavirus cases have been confirmed around the world.

The disease has already killed more than 1,300 people globally.

And there are 15 confirmed cases in the U.S. but health officials expect that number will rise over the days and weeks ahead.

The Centers for Disease Control and Prevention (CDC) is preparing for a worst-case scenario: a widespread coronavirus outbreak in the United States.

"I think this virus is with us beyond this season, beyond this year and I think eventually, the virus will find a foothold and we will get community-based transmission," Dr. Robert Redfield, the Director of the CDC, told CNN and WITI.

Experts say the disease can be spread by people who aren't showing any symptoms.

"You can start to think of it in a sense like the seasonal flu. The only difference is we don't understand this virus. At least the seasonal flu, we pretty much understand how it acts."

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