Harris County Judge Lina Hidalgo, right, asks Harris County Public Health Executive Director Dr. Umair A. Shah, left, a question inside the intensive care unit during a tour of the new Harris County Non-Congregate Medical Shelter at NRG Park Saturday, April 11, 2020, in Houston. The new temporary setup will have 250 beds initially with a capacity of 2000 beds, if needed, to help relieve pressure on the hospital system from COVID-19 patients. Activation is not intended at this time. (AP Photo/David J. Phillip)

The United States became the world leader in coronavirus deaths Saturday, a grim indicator of the country’s status as the global epicenter of the pandemic.

As of Saturday afternoon, the U.S. had recorded about 519,400 COVID-19 cases and 20,071 deaths, according to Johns Hopkins University statistics.

The figures showed the U.S. leading all other countries in the number of confirmed cases and fatalities, surpassing Italy’s death toll for the first time. Italy’s total was 19,468 on Saturday, Hopkins’ statistics showed.

The U.S. also became the world’s first country to report more than 2,000 COVID-19 deaths in a single day. The U.S. reported 2,108 fatalities Friday, the world’s highest one-day death toll since the outbreak began in China in late December.

New York is the hardest-hit state in the U.S., with Governor Andrew Cuomo reporting Saturday that there were 783 deaths on Friday, raising the state’s death toll to more than 8,600.

To help stem the spread of the virus, New York City Mayor Bill de Blasio announced the city’s public schools would remain closed through the end of the school year for the 1.1 million children in the city’s system.

De Blasio said the decision was “painful” but “I can also tell you [it] is the right thing to do. It will clearly help us save lives.”

The World Health Organization said Saturday that it was examining reports of recovered COVID-19 patients testing positive again in South Korea as they were about to be discharged from hospitals.

Jeong Eun-kyeong, director of South Korea’s Centers for Disease Control and Prevention, told reporters the virus might have been “reactivated” in 91 patients instead of their being reinfected.

The WHO said in a statement, “We are aware of these reports of individuals who have tested negative for COVID-19 using PCR [polymerase chain reaction] testing and then after some days testing positive again.”

The organization said it was “closely liaising with our clinical experts and working hard to get more information on those individual cases.”

South Korean health officials said epidemiological investigations were underway to determine the causes of the apparent reactivations.

As the WHO and countries throughout the world grapple with containing the pandemic, the coronavirus continues its spread as billions of people on lockdown celebrate Easter weekend from their homes.

There were more than 1.76 million cases and more than 108,000 deaths worldwide — in 193 countries — as of Saturday afternoon, according to Hopkins’ statistics.

U.S. President Donald Trump said Friday that deciding when to reopen the country would be “the biggest decision I’ve ever had to make” and that he would weigh the pros and cons of the decision with his health and economic advisers.

What was not clear, however, was whether all the states would follow what Trump said. Trump did not officially close down the country, leaving each governor, instead, to decide for his or her state.