Late on Friday, New York City mayor Bill de Blasio announced the city now has 5151 confirmed cases of coronavirus, which he says is one-third of all the cases in the U.S. The number has increased by more than a thousand since yesterday.

The Guardian writes:

“That’s just the start. “The latest figures reflect only the tip of an iceberg,” said Theodora Hatziioannou, an associate professor in virology at the Rockefeller University in Manhattan.

“Keep in mind that estimates suggest each infected person transmits the virus to another two to three people, who in turn can transmit to others, and you begin to grasp the magnitude of the problem.”

According to NBC News, the head of the Army Corps of Engineers was scouting empty New York hotels, dorms and other buildings that could be quickly converted into hospitals.