Coronavirus is not the flu. It's worse.

On March 11, the World Health Organization declared the outbreak a pandemic, a new disease that has spread around the world. Many countries have seen reported cases of the virus rise within their borders.

“We will see more cases, and things will get worse,” Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, told members of the House Oversight Committee on March 11. “How much  worse … will depend on our ability to do two things: to contain the influx in people who are infected coming from the outside and the ability to contain and mitigate within our own country.”

The spread of the virus and slow rollout of testing mean reported case numbers are changing quickly.