The coronavirus has claimed its first life on US soil — a man in his 50s who died in a Seattle-area hospital, officials said Saturday.

The grim news of a first fatality — and further dire revelations out of the Pacific Northwest, including a Washington State nursing home where as many as 50 patients and workers could be infected — shows the West Coast is now bearing the brunt of the nation’s growing COVID-19 crisis.

On the East Coast, hundreds of cases are being monitored, but by Saturday night, the only diagnosed virus patient, in Boston, has recovered, according to federal officials.

City health officials also had good news Saturday: The only patient who was being monitored for coronavirus has tested negative.

That person had fallen ill following a trip to Italy, where 1,128 people have been infected, including 29 who have died.

Worldwide, 87,000 people have fallen ill with the virus, and nearly 3,000 have died, mostly in Hubei province in central China, according to the latest global statistics, as tracked by Johns Hopkins University.

Chinese scientists knew about the coronavirus in December, but were repeatedly ordered by Beijing to suppress the evidence, the Sunday Times of London reported.

President Trump responded to the U.S. fatality and the growing global crisis by announcing new travel restrictions involving three hot-spot countries: Iran, Italy and South Korea.

Foreigners who have traveled in those countries — as well as in China, where there is already a ban — must wait 14 days before entering the US.

“We will do everything in our power to keep the virus and those carrying the infections from entering our country,” the president told a cheering crowd later Saturday, at the Conservative Political Action Conference in Maryland.

Few details were released about the man who died, other than that he had other underlying medical conditions and succumbed to the virus only hours after county health officials became aware that he was infected.

But he is one of at least four patients in California, Oregon and Washington who have now caught the virus despite not having traveled outside the US.

That means the four caught the coronavirus from local infected people yet to be identified, a scenario of grave concern to health-care experts.

Another of the so-called “community-spread” patients is a teen boy from Snohomish County, Wash., whose high school will be closed for deep cleaning Monday, officials said.

Meanwhile, the Life Care Center, a nursing home in Kirkland, Wash., was shaping up as the country’s first cruise-ship-style incubator of the virus. At least one health-care worker there and a female patient in her 70s had tested positive for the virus.

Test results are still pending on as many as 50 other people connected to the home, including several residents with pneumonia.

“We’re in the beginning stages of our investigation” into a potential outbreak centered on the home, said Dr. Jeff Duchin, Seattle and King County public health officer.

Gov. Jay Inslee declared a state of emergency after the COVID-19 death.

“We will continue to work toward a day where no one dies from the virus,” he said.

But in New York, there was only good news and continuing caution.

“Our latest information is no patients are now being monitored,” a city Department of Health spokesman told The Post on Saturday afternoon.

Starting this week, samples from suspected patients in New York state will be tested in Albany, rather than sent to CDC headquarters in Atlanta.

The city will begin local testing, using CDC-provided kits Tuesday, the spokesman said.

Additional reporting by Eileen AJ Connelly and Bernadette Hogan