Patients and medical workers wear personal protective equipment due to COVID-19 concerns outside the emergency room at NYU Langone Medical Center, Monday, April 13, 2020, in New York. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/John Minchillo)

New York's coronavirus death toll topped 10,000 and the worldwide number of confirmed cases hovered around 2 million on Monday, even as the lack of fresh hot spots globally yielded a ray of optimism and fueled discussions about how some places might begin to reopen.

The brunt of the disease has been felt most heavily in New York, Italy, France, Spain and the United Kingdom, but grim projections of a virus that would spread with equal ferocity to other corners of America and the world have not yet materialized after more than a month of measures meant to blunt its impact.

An online dashboard that tracks the global number of confirmed coronavirus cases, maintained by Johns Hopkins University, late Monday night showed the number of cases in the U.S. approaching 683,000, with more than 2 million worldwide. The site was later adjusted to reflect nearly 582,000 cases in the U.S. and 1.9 million cases worldwide. It was not immediately clear why the numbers changed. Of those 1.9 million cases, nearly 120,000 people have died, while nearly 449,600 have recovered.

The death toll in populous states such as Florida and Pennsylvania was on par with some individual counties outside New York City. Houston, the nation's fourth-largest city and a hub for immigrant communities and business travelers in the energy industry, has been largely spared compared to other parts of the U.S. As Colorado deaths surpassed 300 on Monday, Gov. Jared Polis compared that figure to New York's thousands and called it "a tragic indication of our success in Colorado."

A woman stands by her open window while playing amplified music and with disco lights, as the lockdown to combat the spread of coronavirus continues in Madrid, Spain, Monday, April 13, 2020. Many people are inventive and inspirational as they combat the social effects of self isolation. The new COVID-19 coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness and even be fatal. (AP Photo/Paul White)

Officials around the world worried that halting quarantine and social-distancing measures could easily undo the hard-earned progress that those steps have achieved in slowing the spread.

Still, there were signs countries were looking in that direction. Spain permitted some workers to return to their jobs, while a hard-hit region of Italy loosened its lockdown restrictions. Governors on both coasts of the U.S. announced that they would join forces to come up with a coordinated reopening at some point, setting the stage for a potential conflict with President Donald Trump, who asserted that he is the ultimate decision-maker for determining how and when to reopen.

Trump continued those assertions during an afternoon White House briefing on Monday, pushing back against reporters' questions about whether the president or governors have the authority to ease the restrictions. He said his administration has "a very good relationship" with the governors, but "the federal government has absolute power" in that decision-making process if it chooses to exercise it.

Amid concerns of the spread of COVID-19, Maclola Orozco restocks food at El Rancho grocery store in Dallas, Monday, April 13, 2020. (AP Photo/LM Otero)

The Trump administration also sought to delay deadlines for the 2020 census because of the outbreak, a move that would push back timetables for releasing data used to draw congressional and legislative districts.

U.S. Treasury Secretary Steven Mnuchin said at Monday's briefing that he expects more than 80 million Americans will have tax rebates directly deposited into their bank accounts by Wednesday. The rebates are aimed at boosting the economy as the country responds to the coronavirus.

New York saw a few positive signs Monday even as it reached another bleak milestone. It marked the first time in a week that the daily toll dipped below 700. Almost 2,000 people were newly hospitalized with the virus Sunday, though once discharges and deaths are accounted for, the number of people hospitalized has flattened to just under 19,000.

A worker at F.A.B.R.I.C., a non-profit organization providing resources for emerging fashion designers, does a quality check on a stack of PPE before the items get shipped to area Dignity Health employees due to the coronavirus Monday, April 13, 2020, in Tempe, Ariz. Workers at F.A.B.R.I.C. are working around the clock to create thousands of FDA approved isolation gowns for workers on the front lines of the pandemic. (AP Photo/Ross D. Franklin)

"This virus is very good at what it does. It is a killer," Gov. Andrew Cuomo said Monday.

In the U.S., about half of the more than 22,000 deaths reported are in the New York . Meanwhile, Johns Hopkins' tracking maps showed a dense patchwork of coronavirus cases along the Northeast corridor, as well as significant outbreaks corresponding to other major metropolitan areas—though nothing on the scale of what New York has endured.

Houston's 18 total deaths since the start of the outbreak make up a tiny fraction of the one-day toll in New York City, prompting Mayor Sylvester Turner to say the city was achieving its goal of slowing "the progression of this virus so that our health care delivery system would not be overwhelmed."

Dr. Sebastian Johnston, a professor of respiratory medicine at Imperial College London, said it appeared that COVID-19 had peaked in much of Europe, including France, Spain, Germany, Italy and the U.K. He was worried the virus might now start to take off in countries across Latin America, Africa and Southeast Asia. There's also concern about Russia.

Recently dug graves sit empty at the San Vicente cemetery in Cordoba, Argentina, Monday, April 13, 2020. Six to seven times more graves than normal are being dug in Cordoba, as a precaution amid the deadly, new coronavirus health emergency, according to Press Secretary of the Union of Municipal Workers and Employees of Córdoba, Damián Bizzi. (AP Photo/Nicolas Aguilera)

China, where the pandemic began, reported 89 new virus cases on Tuesday, 86 of them among travelers arriving from abroad, but no new deaths. The country's total death toll stood at 3,341 out of 82,249 cases.

South Korea on Tuesday reported its 13th day in a row with fewer than 100 confirmed cases of the virus, as infections continued to wane in the worst-hit city of Daegu and nearby towns. In early March, the country was reporting about 500 new cases per day.

Hot spots may yet emerge as states lift stay-at-home orders, said Dr. Christopher Murray, director of the University of Washington institute that created widely cited projections of virus-related deaths. He pointed to states where the number of COVID-19 cases is still climbing: Massachusetts, Pennsylvania, Texas and Florida.

"Don't consider relaxing social distancing in the near term," Murray said he'd advise leaders in those states. "You need to stay the course."

A doctor waits at the front door of a person's home before doing a new coronavirus fast test in Lima, Peru, Monday, April 13, 2020. Peruvians can call a telephone number to report that they have symptoms of COVID-19, and the state organized medical brigades will visit and do rapid tests to confirm or rule out new COVID-19 infections. (AP Photo/Rodrigo Abd)

To date, some U.S. infections have taken off like sparks starting fires, while others have sputtered out. Trevor Bedford, whose lab at Seattle's Fred Hutchinson Cancer Research Center has been tracking the pandemic using the virus's genetic code, acknowledges it's a "dice roll" that makes it hard to predict hot spots.

And when restrictions are eased, people will not immediately dive back into their social connections, at least not without precautions, Bedford said.

A study released Monday by the Centers for Disease Control and Prevention, relying on data from mobile devices in New Orleans, New York City, San Francisco and Seattle, suggested that social-distancing policies prompted more people to stay at home in March and might have curbed spread of the virus.

The report "provides some very early indications that these measures might help slow the spread of COVD-19," the authors said.

A newly painted mural shows a youth wearing a face mask, during a government ordered lockdown to prevent the spread of the new coronavirus in Bogota, Colombia, Monday, April 13, 2020. (AP Photo/Fernando Vergara)

The infection rate remains relatively low in areas of the developing world that have poor or nonexistent health care infrastructure. The rapid spread of the coronavirus beyond cities to more rural areas often depends on travel and , said Dr. Mike Ryan, the World Health Organization's emergencies chief.

But he noted that rural areas often have less sophisticated health surveillance systems to pick up potential disease clusters, prompting the question, "Is it that it's not there or is it that we're not detecting the disease when it is there?"

In some European countries, officials pointed to positive signs as they began prepping for the reopening of largely shuttered economies and industries.

Italian authorities announced on Monday that there were 3,153 new cases in the last 24 hours, approximately a 1.9 percent increase. That brings the country's overall toll of known cases to nearly 160,000. The day-to-day death toll, 566, however, was up, from the 431 new deaths registered on Sunday.

  • Cots, to be used by people infected with the new coronavirus, fill an indoor soccer court at the Argentine Football Association training facility in the outskirts of Buenos Aires, Argentina, on Monday, April 13, 2020. COVID-19 disease causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Victor R. Caivano)

  • Health officials, wearing protective face masks and suits as a preventive measure against the spread of the coronavirus, perform local region dances during an impromptu ceremony to send off people after spending a two-week mandatory quarantine at a university dormitory, in Burdur, southwestern Turkey, Monday April 13, 2020. One hundred fifty one Turkish citizens that travelled back from Russia, Kazakhstan and Uzbekistan, were sent to their homes in 32 different cities, after they were placed under quarantine on March 29. Six people who are positive with Covid-19 are treated at the local hospital. (Mesut Madan/DHA via AP)

  • Homeless people get in line to receive food baskets from private donors, Monday, April 13, 2020 downtown Johannesburg. Because of South Africa's imposed lockdown to contain the spread of COVID-19, many are not able to work. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death.(AP Photo/Jerome Delay)

  • A person wearing a protective face mask walks by the Robert Indiana sculpture "LOVE" at John F. Kennedy Plaza, commonly known as Love Park, in Philadelphia, Monday, April 13, 2020. (AP Photo/Matt Rourke)

  • Police officers pull over cars at a road block on a main road leading out of the city, in Rome, Monday, April 13, 2020. The Italian government says beefed-up police patrols over Easter weekend have resulted in more than 12,500 people being sanctioned and 150 facing criminal charges for allegedly violating anti-coronavirus lockdown measures, which only allow people to move around for work, health reasons or some other necessity, such as grocery shopping or walking the dog. The new coronavirus causes mild or moderate symptoms for most people, but for some, especially older adults and people with existing health problems, it can cause more severe illness or death. (AP Photo/Andrew Medichini)

  • A volunteer disinfects the Karachi Press Club building in an effort to contain the outbreak of the coronavirus, in Karachi, Pakistan, Monday, April 13, 2020. (AP Photo/Fareed Khan)

  • A worker wearing a protective face mask moves between beds of tulips at Dilworth Park in Philadelphia, Monday, April 13, 2020. (AP Photo/Matt Rourke)

  • Members of Hevra Kadisha, an organization which prepares bodies of deceased Jews for burial according to Jewish tradition, lower the body of Israel's ex-Chief Rabbi Eliahu Bakshi-Doron who died from coronavirus, during his funeral in Jerusalem, Monday, April 13, 2020. (AP Photo/Oded Balilty)

Italy's day-to-day increase in infections was one of the lowest in weeks, bolstering a generally downward trend. Slightly eased restrictions were about to take effect in some sectors of the country, such as allowing stores selling necessities for newborns to reopen.

In hard-hit Spain, workers were permitted to return to some factory and construction jobs as the government looked to restart manufacturing. Retail stores and services were still required to stay closed, and the government required office workers to keep working from home.

Some health experts and politicians argue that it's premature to ease the lockdown in a nation that has suffered more than 17,750 deaths and reported more than 170,000 infections, second only to the United States' 581,670 cases.

Health Minister Salvador Illa said Monday that he would proceed with "the utmost caution and prudence ... and always based on scientific evidence."