U.S. Surgeon General Jerome Adams speaks about the coronavirus in the James Brady Press Briefing Room of the White House, Friday, April 3, 2020, in Washington. (AP Photo/Alex Brandon)
U.S. Surgeon General Jerome Adams speaks about the coronavirus in the James Brady Press Briefing Room of the White House, Friday, April 3, 2020, in Washington. (AP Photo/Alex Brandon) Credit: Alex Brandon

NEW YORK — Americans braced for what the nation’s top doctor warned Sunday would be “the hardest and saddest week” of their lives while Britain assumed the unwelcome mantle of deadliest coronavirus hotspot in Europe after a record 24-hour jump in deaths that surpassed even hard-hit Italy.

“This is going to be our Pearl Harbor moment, our 9/11 moment,’’ U.S. Surgeon General Jerome Adams told “Fox News Sunday.”

New York City, the U.S. epicenter of the pandemic, saw a glimmer of hope, with Gov. Andrew Cuomo saying that daily deaths had dropped slightly, along with intensive care admissions and the number of patients who needed breathing tubes inserted.

Still, he warned that it was “too early to tell” the significance of those numbers.

Italy and Spain also got some encouraging news. Italy registered its lowest day-to-day increase in deaths in more than two weeks — 525, said Angelo Borrelli, the head of the national Civil Protection agency.

The pace of infection also seemed to be slowing. The country recorded 4,316 new cases Sunday. Earlier in the outbreak, daily increases topped 6,000.

Even so, Borrelli warned: “This good news shouldn’t make us drop our guard.”

Confirmed infections fell in Spain too, and new deaths declined for the third straight day, dropping to 674 — the first time daily deaths have fallen below 800 in the past week.

“We are starting to see the light at the end of the tunnel,” Spanish Prime Minister Pedro Sánchez said.

The outlook in Britain remained bleak. As of Sunday, Britain has recorded more than 4,900 virus deaths overall among nearly 48,000 cases. Those coming down with the virus in the U.K. include Prime Minister Boris Johnson, the health secretary, England’s chief medical official and Prince Charles, heir to the throne.

There are wide fears that Johnson’s Conservative government did not take the virus seriously enough at first and that spring weather will tempt Britons and others to break social distancing rules.

In an address to the nation, Queen Elizabeth II appealed to Britons to exercise self-discipline in “an increasingly challenging time.”

The 93-year-old monarch said the pandemic had caused enormous disruptions, bringing grief, financial difficulties and daunting challenges to everybody. It is only the fourth time since her reign began in 1953 that she has given such an address.

“I hope in the years to come, everyone will be able to take pride in how they responded to this challenge,” she said in remarks that were released in advance. “And those who come after us will say that the Britons of this generation were as strong as any.”

At the Vatican, Pope Francis celebrated Mass and blessed palms for Palm Sunday in a near-empty St. Peter’s Basilica. Usually tens of thousands of faithful would have crowded the square outside to attend a papal Mass.

Holy Thursday and Easter services will be held the same way. In the pope’s native Argentina, the faithful were using plants at home for a “virtual” blessing during a livestream of the Palm Sunday service.

Worldwide, more than 1.2 million people have been confirmed infected and more than 65,000 have died, according to Johns Hopkins University. The true numbers are certainly much higher, due to limited testing, different ways nations count the dead and deliberate under-reporting by some governments.

The rapid spread of the virus in the United States has prompted a chaotic scramble for desperately needed medical equipment and protective gear, prompting intense squabbling between the states and the federal government.

Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said Sunday that he hoped the pace of new infections would plateau soon, but that the virus is unlikely to be completely eradicated this year. That means the U.S. could see the a resurgence during the next flu season, he said.

Speaking on CBS’s Face the Nation, Fauci said the prospect of a resurgence is why the U.S. is working so hard to be better prepared, including working to develop a vaccine and conducting clinical trials on therapeutic interventions.