A pandemic of the novel coronavirus has now killed more than 1.3 million people worldwide.
Over 58.7 million people across the globe have been diagnosed with COVID-19, the disease caused by the new respiratory virus, according to data compiled by the Center for Systems Science and Engineering at Johns Hopkins University. The actual numbers are believed to be much higher due to testing shortages, many unreported cases and suspicions that some national governments are hiding or downplaying the scope of their outbreaks. The criteria for diagnosis -- through clinical means or a lab test -- has also varied from country to country.
The United States is the worst-affected nation, with more than 12.2 million diagnosed cases and at least 256,783 deaths.
Nearly 200 vaccine candidates for COVID-19 are being tracked by the World Health Organization, at least 10 of which are in crucial phase three studies. Of those 10 potential vaccines in late-stage trials, there are currently five that will be available in the United States if approved.
New York City public schools will close for in-person learning Thursday because the city has reached its 3% positivity rate threshold, said Chancellor Richard Carranza.
All 300,000 students will learn remotely until further notice, he said.
"This is a temporary closure, and school buildings will reopen as soon as it is safe to do so," Carranza said.
Students demonstrate during a rally to call on New York Mayor Bill de Blasio to keep schools open amidst the coronavirus pandemic, Nov. 14, 2020, in New York.
Mary Altaffer/AP, FILE
According to state data, New York City’s seven-day rolling average positivity rate is 2.5%.
As of Monday, the schools had a positivity rate of 0.23% out of more than 140,000 students and staff tested.
vABC News' Aaron Katersky contributed to this report.
Nov 18, 2020, 2:15 PM EST
US facing 'worst rate of rise in cases'
White House coronavirus task force member Adm. Brett Giroir said the U.S. is facing "the worst rate of rise in cases that we've seen."
A woman, accompanied by a child, looks over as an airline crew wearing full personal protective equipment against COVID-19 walks through the international terminal at Los Angeles International Airport in Los Angeles on Nov. 17, 2020.
Keith Birmingham/The Orange County Register via AP
Workers in PPE are seen at the Judiciary Square Covid-19 testing site in Washington, D.C., Nov. 18, 2020.
Mandel Ngan/AFP via Getty Images
"This is not crying wolf," he stressed in an interview on MSNBC.
Though "vaccines are around the corner," Giroir said, state and local officials must be "very rigorous" about limiting certain businesses, limiting crowds in indoor spaces and enforcing mask use.
"If we do not do that, we will lose tens of thousands of Americans by the time the vaccine is out and widely distributed," he said.
Giroir also urged Americans to remember that a negative test is not a "free pass" to forgo masks and social distancing over the holidays.
A sign on a Muni bus advises that passengers are required to wear masks, during the coronavirus pandemic Tuesday, Nov. 17, 2020, in San Francisco.
Jeff Chiu/AP
"That negative test today does not mean you're going to be negative tomorrow or the next day, and certainly not by Thanksgiving. And it is not a free pass to go without all the important measures that we want, particularly mask wearing, physical distancing and following all the recommendations that the CDC has for the holidays," Giroir said.
ABC News' Brian Hartman contributed to this report.
Nov 18, 2020, 12:28 PM EST
New surge hits South Korea
South Korea is on edge after a surge in new COVID-19 cases this week.
An attendee stands in a sterilizer station as a precaution against the coronavirus, before entering the DX Korea 2020 defense expo in Goyang, South Korea, Nov. 18, 2020. South Korea has recorded its largest daily increase in coronavirus infections in nearly three months as it gets set to tighten social distancing rules in the greater Seoul area.
Ahn Young-joon/AP
Since the outbreak in late February, South Korea has mostly maintained low COVID-19 number.
But this week this country is seeing a steady increase and hit the highest in 81 days at 313 newly confirmed cases.
South Korea now has 29,311 cases and 496 deaths.
ABC News' Joohee Cho Christine Theodorou contributed to this report.
Nov 18, 2020, 11:31 AM EST
Delta Air Lines extending middle-seat block through March
Delta Air Lines will continue to block middle seats through March 2021 "because customers tell us that adds confidence to their travel experience," CEO Ed Bastian told "GMA 3: What You Need to Know."
Bastian stressed that Delta hasn't "pulled back at all with our safety and cleaning protocols."
"Every airplane gets sanitized with electric spray fogging before we take off. We continue to focus on the filtration systems ,and they're state-of-the-art, and customers are required to wear masks," he said. "We don't have a single documented transmission of COVID aboard any of our planes."
Seat are disinfected inside of a Delta Airplane between flights at the Ronald Reagan Washington National Airport in Arlington, Va., July 22, 2020.
Nathan Ellgren/AP, FILE
"While travel is slow, it's steadily improving," Bastian said. "We're expecting over the Thanksgiving holiday period, starting on Friday for the next 10 days, about 2 million customers."
ABC News' Andrea Amiel and Lataya Rothmiller contributed to this report.
