US coronavirus: Outbreak clusters grow on a ship at sea, in a nursing home, and near New York

Slide 1 of 50: Choir members wearing face masks, amid concerns about the spread of the COVID-19 novel coronavirus, attend a Sunday service at the Yeouido Full Gospel Church in Seoul on March 8, 2020. - Seoul's biggest protestant church held a live stream of its reguar Sunday service as part of effort to prevent the spread of the COVID-19 novel coronavirus among its usual 20,000-strong gathering, with only a handful of senior church officials in attendance. (Photo by Ed JONES / AFP) (Photo by ED JONES/AFP via Getty Images)

The number of novel coronavirus cases in the United States continued to mount on Saturday, bringing the nationwide total to more than 400. At least 19 people have died.

At least 5,861 coronavirus tests have been completed by the US Centers for Disease Control and Prevention and public health laboratories, said Dr. Stephen Hahn, US Food and Drug Administration commissioner, in a briefing at the White House Saturday.

However, that does not mean 5,861 people have been tested. Currently, each person tested typically has two swabs taken — one from the nose and one from the throat. This number does not include tests performed at private or commercial labs.

Health officials at the White House Saturday could not say exactly how many people have been tested.

Positive tests are coming from all over the country, including Washington, DC, which confirmed its first presumptive positive case on Saturday, according to Mayor Muriel Bowser. The patient has no travel history outside of the US and there is no evidence of widespread community transmission of coronavirus in Washington, DC, Bowser said.

But most of the cases were in communities in Washington state, New York and California. Authorities were working to contain the spread of the virus on a cruise ship off California's coast.