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Officials call for greater vigilance, as Florida and South Carolina set repeated highs for new daily cases.

As record daily highs for new coronavirus cases were repeatedly set this week in Florida and South Carolina, officials there aimed to subdue alarm while doubling down on calls for greater vigilance, mask-wearing and social distancing.

Florida, among the hardest hit states, reported 3,822 new cases on Friday, beating the single-day record it set the previous day, and bringing its total number of cases close to 90,000. A total of 3,104 people have died.

South Carolina also reported on Friday a record of 1,081 new daily cases. It was the seventh time in 11 days that the state broke its single-day case record, and the state epidemiologist on Thursday pleaded with residents to wear masks and practice social distancing.

“We understand that what we’re continuing to ask of everyone is not easy and that many are tired of hearing the same warnings and of taking the same daily precautions,” Dr. Linda Bell, the epidemiologist, said in a statement. “Every day that we don’t all do our part, we are extending the duration of illnesses, missed work, hospitalizations and deaths in our state.”

The World Health Organization issued a dire warning on Friday that the coronavirus pandemic is accelerating, and noted that Thursday was a record day for new cases — more than 150,000 globally.

“The world is in a new and dangerous phase,” said Dr. Tedros Adhanom Ghebreyesus, the director general of the W.H.O. “Many people are understandably fed up with being at home. Countries are understandably eager to open up their societies and their economies. But the virus is still spreading fast. It is still deadly, and most people are still susceptible.”

If the outbreak was defined early on by a series of shifting epicenters — including Wuhan, China; Iran; northern Italy; Spain; and New York — it is now defined by its wide and expanding scope. According to a Times database, 81 nations have seen a growth in new cases over the past two weeks, while only 36 have seen declines.

Dr. Tedros said that almost half of the new cases reported on Thursday came from the Americas. Large numbers are also being reported from Africa, South Asia and the Middle East.

Dr. Tedros urged individuals to continue to maintain distance from others, to cover their noses and mouths with masks when appropriate and to wash their hands. He said nations must continue to find, isolate, test and care for every person infected with the virus, and to test and quarantine every contact. “We call on all countries to exercise extreme vigilance,” he said.

But risks are multiplying as nations begin to reopen their economies.

In India, which initially placed all 1.3 billion of its citizens under a lockdown — then moved to reopen even with its public health system near the breaking point — officials reported a record number of new cases Wednesday. And the virus is now spreading rapidly in nearby Pakistan and Bangladesh as well.

It took Africa nearly 100 days to reach 100,000 cases, the W.H.O. has noted, but only 19 days to double that tally. South Africa now averages a thousand more new cases each day than it did two weeks ago.

And some countries where caseloads had appeared to taper — including Israel, Sweden and Costa Rica — are watching them rise again. Costa Rica’s health minister said Friday that the country was halting reopening its economy because of the increase in cases.

Gov. Gavin Newsom of California, where there has been a surge, on Thursday ordered people to wear face masks in most indoor — and some outdoor — public settings. This week Gov. Doug Ducey of Arizona, which has seen record numbers of new daily cases, gave mayors the power to require masks. Previously, municipalities there were forbidden to introduce more restrictive rules.

Three pro sports teams shut down facilities in Florida, amid worries over player safety.

Two Major League Baseball clubs, the Philadelphia Phillies and the Toronto Blue Jays, and a professional hockey team, the Tampa Bay Lightning, shut down their training facilities in Florida this week, after several players and staff members tested positive and others showed symptoms consistent with the virus.

The Phillies said in a statement Friday that five players and three staff members working at the club’s facility in Clearwater had tested positive for the virus, first reported by NBC. The club said eight staff members tested negative and more than 30 others were awaiting results.

The Blue Jays facility, in nearby Dunedin, was closed Thursday after one of the players appeared to exhibit Covid-19 symptoms, according to ESPN. And ESPN and the Canadian network TSN reported that the Lightning shut down a facility after multiple players and staff tested positive. Both the N.H.L. and M.L.B. are hoping to start up in late July.

Florida has become a hub for sports leagues trying to restart, but the state has seen a sharp rise in cases. The N.B.A., W.N.B.A., Major League Soccer and others are all attempting to hold their upcoming seasons there.

The shutdowns on Friday cast a shadow over the return of professional sports, which this week became a source of friction between Mr. Trump and Dr. Anthony S. Fauci, the nation’s top infectious disease expert.

Mr. Trump rebuked Dr. Fauci after Dr. Fauci said Thursday on CNN that the National Football League would need to replicate the kind of safety “bubble” planned by professional basketball and soccer leagues to safely resume play.

“Unless players are essentially in a bubble — insulated from the community and they are tested nearly every day — it would be very hard to see how football is able to be played this fall,” Dr. Fauci said.

Mr. Trump wrote on Twitter on Friday that “Tony Fauci has nothing to do with N.F.L. Football. They are planning a very safe and controlled opening.”

U.S. ROUNDUP

As New York City prepares for a broader reopening, the mayor says: Take it slow.

A short time later, Gov. Andrew M. Cuomo ended his run of more than 100 consecutive daily news conferences, with an address from his office. After confirming that New York City would ease more restrictions on Monday, he presented a montage of New Yorkers during the crisis that featured his own narration.

During his address, Mr. Cuomo warned that “Covid isn’t over” — there were 25 additional deaths reported statewide — and said more work was needed to contain it. But he also struck a reflective and celebratory tone, citing continued low levels of virus-related infections, hospitalizations and deaths.

“I’m so incredibly proud of what we all did together, and as a community,” Mr. Cuomo said. “We reopened the economy and we saved lives.”

Here’s what else is happening in the U.S.:

  • In Washington, the mayor said that some restrictions in the nation’s capital would ease on Monday, allowing gatherings of up to 50 people, limited indoor dining, and reopening playgrounds and fitness centers.

  • In New Jersey, residents of nursing homes and other long-term care facilities can begin seeing visitors on June 21, state officials announced. As of Friday, more than 6,150 deaths had been reported in long-term care facilities, almost half the total number of deaths in the state. The overall death toll grew by 37 statewide.

    Visits must take place outdoors, with everyone wearing masks and remaining six feet apart. Visitors who experience symptoms or test positive within 14 days should contact the facility immediately, state officials said.

  • Cruise lines won’t sail from U.S. ports until Sept. 15, the Cruise Lines International Association said, after its member cruise lines agreed to extend a suspension that was to expire on July 24.

  • After three days of record highs, Texas reported at least 3,454 new coronavirus cases Friday. And it became the sixth state in the nation to surpass 100,000 cases, according to a Times database. Cases there have doubled over the past month and at least 2,140 people have died.

“We showed that the virus was already circulating,” said Lucia Bonadonna, an official at the institute. “Probably in asymptomatic or little-symptomatic forms before we had our first local case.”

While the new findings shift the virus’s timeline earlier in Europe, they do not significantly change the pandemic’s known timeline. Chinese officials reported the outbreak in Wuhan on Dec. 31, but later traced cases that emerged as far back as Dec. 1.

Italian scientists and officials have long suspected that the virus had moved undetected in the northern region of Lombardy, an economic hub where there is frequent trade with China, at least weeks before the contagion came to light.

Similar evidence has recently emerged around the world, indicating that by the time the authorities were aware of an outbreak, the virus was already more widespread than initially believed.

In France, a sample taken from a patient on Dec. 27 tested positive last month. And in California, health officials discovered a virus-linked death on Feb. 6, weeks before the earliest recorded case of U.S. community transmission.

In other news from around the world:

  • Prime Minister Shinzo Abe of Japan lifted a virus-related ban on domestic travel. Mr. Abe’s government is also in discussions to ease international travel bans for passengers arriving from Australia, New Zealand, Thailand and Vietnam.

  • Britain reduced its Covid-19 alert level to three from four. At Level 3, the virus is considered to remain “in general circulation.” But the change paves the way for a gradual easing of social-distancing measures.

  • Spain updated its death toll from the virus for the first time in almost two week. The country’s health ministry said 28,313 people had died, up from 27,136 on June 7. Officials said the intervening time had been used to ensure that all Covid-19 fatalities were properly recorded. Last month, the ministry abruptly reduced its tally by about 2,000, citing testing uncertainties.

  • South Korea reported 49 more cases, as a second wave of infections continued to spread in the Seoul metropolitan area.

  • In Canada, a doctor who traveled across a provincial border has been accused of igniting a coronavirus outbreak. ​ ​​The backlash against him has spurred debate over how to balance collective responsibility and individual freedom during a pandemic.

Older adults may be left out of some clinical trials for a vaccine or treatment.

Health experts worry that in the race to find drugs and vaccines, a substantial proportion of studies may be excluding older subjects, purposely or inadvertently, even as 80 percent of American deaths have occurred in people over age 65.

“A year from now, when these trials are published, I don’t want to see that there’s no one in them over 75,” said Dr. Sharon K. Inouye, a geriatrician at Harvard Medical School and Hebrew SeniorLife. “If they create a drug that works really well in healthy 50- and 60-year-olds, they’ve missed the boat.”

She and her team have reviewed 241 interventional Covid-19 studies that have been undertaken in the United States and are listed on clinicaltrials.gov, a site maintained by a division of the National Institutes of Health.

They found that 37 of these trials — which test drugs, vaccines and devices — set specific age limits and would not enroll participants older than 75, 80 or 85. A few even excluded those over 65.

Another group of 27 trials set no maximum age but used study designs that could nevertheless disqualify many older adults. Some excluded people with illnesses common among the older population, like hypertension or diabetes, even if participants controlled the disease through medication. “Surrogates for age exclusion,” Dr. Inouye said.

There is a long history of older people being excluded from clinical trials, even when the diseases in question disproportionately affected this group.

“Ideally, the patients enrolled in a randomized clinical trial reflect the demographics of the disease,” said Dr. Mark Sloan, a hematologist leading a Covid-19 drug study at Boston Medical Center, in an email. “Unfortunately, this is seldom the case.”

Chinese scientists see a European link to the Beijing outbreak, but the W.H.O. sees less.

Genetic analysis of the coronavirus spreading in Beijing indicates that it has recent roots in Europe, Chinese government scientists have told the World Health Organization.

That is a strong suggestion that “the disease was probably imported from outside Beijing at some point,” though not that Europe was the origin of the new outbreak, Dr. Michael Ryan, executive director of the health emergency services program at the W.H.O., said on Friday.

Chinese researchers have posted the genomic sequence to online databases for further analysis, Dr. Ryan said.

Officials have been racing to explain and contain the new outbreak in the Chinese capital, a cluster of more than 180 infections at the vast Xinfadi wholesale market that emerged after 56 days of no new locally-transmitted cases.

There has been no wholesale lockdown, but the city’s schools have been shut and strict limitations imposed in high-risk neighborhoods. On Thursday, thousands of restaurant workers lined up around the city to get tested.

Travelers are being required to show proof of a negative nucleic acid test taken within seven days of boarding planes or trains out of Beijing, and the wait-list at some hospitals stretches into September, according to Caixin, a Chinese investigative news outlet.

The health authorities also released new guidelines urging the public to prevent “splash contamination” by not rinsing raw meat or seafood directly under the tap.

Reporting was contributed by Maggie Astor, Brooks Barnes, Keith Bradsher, John Branch, Gillian R. Brassil, Emma Bubola, Chris Buckley, Nancy Coleman, Maria Cramer, Michael Crowley, Gillian Friedman, Thomas Gibbons-Neff, Jenny Gross, Mohammed Hadi, Annie Karni, Sarah Kliff, Jesse McKinley, Raphael Minder, Elian Peltier, Motoko Rich, Eric Schmitt, Jeanna Smialek, Mitch Smith, Kaly Soto, Paula Span, Matt Stevens, Katie Thomas, Neil Vigdor, Daisuke Wakabayashi, David Waldstein and Mihir Zaveri.