A pandemic of the novel coronavirus has now killed more than 1.3 million people worldwide.
Over 53.2 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.
Since the first cases were detected in China in December, the virus has rapidly spread to every continent except Antarctica. The United States is the worst-affected nation, with more than 10.7 million diagnosed cases and at least 244,283 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.
Here's how the news is developing. All times Eastern.
Nov 12, 2020, 2:48 PM EST
Stay-at-home advisory to go into effect in Chicago due to 'ongoing surge'
A stay-at-home advisory will go into effect in Chicago on Monday morning "due to the alarming and ongoing surge in COVID-19 cases," Mayor Lori Lightfoot announced Thursday.
Despite temperatures in the mid-forties, customers continue to patronize restaurants and bars in the Wicker Park neighborhood of Chicago on Nov. 11, 2020.
Scott Olson/Getty Images
Lightfoot is asking residents to "stay home unless for essential reasons" and "stop having guests over—including family members you do not live with."
She's urging residents to avoid nonessential travel, including canceling traditional Thanksgiving plans.
"Our goal now is the same as it was during the first surge: bend the curve. The more we bend the curve, the more we can reopen our businesses and get our lives back to some sense of normalcy," she tweeted.
Nov 12, 2020, 2:38 PM EST
Hard-hit Ohio sets another daily case record
Ohio has set another one-day record with 7,101 new COVID-19 cases.
Medical staffers wait for patients receiving a COVID-19 test on Nov. 12, 2020, at the Ohio State Expo Center and Fairgrounds in Columbus, Ohio.
Joshua A. Bickel/Columbus Dispatch via USA Today Network
This also marked Ohio's second-highest day of hospital admissions with 268 people admitted, Gov. Mike DeWine said Thursday.
"We are currently at our highest point for both hospitalized and ICU patients since the beginning of the pandemic," DeWine said.
Over 274,000 people have been diagnosed and at least 5,658 people in the state have died.
DeWine announced new restrictions on Wednesday, including that universities will be remote after Thanksgiving businesses must post mask requirement signs at their entrances.
Nov 12, 2020, 2:02 PM EST
Germany, Greece report record case increases
Germany's Robert Koch Institut reported a record one-day increase of 21,866 new COVID-19 cases on Thursday, bringing Germany's total to over 727,000 people diagnosed.
Lothar Wieler, president of the RKI, warned, "it is possible that patients may no longer be able to receive optimal care."
People walk past stalls at the cancelled annual Christmas market during the second wave of the coronavirus pandemic on Nov. 12, 2020, in Essen, Germany.
Andreas Rentz/Getty Images
Greece's National Public Health Organization also reported a record increase in new cases and fatalities on Thursday. Greece has over 66,000 people diagnosed and at least 959 deaths.
Medical workers wearing personal protective equipment prepare to perform a tracheotomy on a patient at the intensive care unit of the George Papanikolaou General Hospital, during the coronavirus disease pandemic in Thessaloniki, Greece, Nov. 11, 2020.
Alexandros Avramidis/Reuters
Health workers wearing face masks to protect against the spread of the coronavirus, take part in a protest at Evangelismos hospital in Athens, Thursday, Nov. 12, 2020.
Thanassis Stavrakis/AP
Italy's Civil Protection Agency reported 37,978 new COVID-19 cases on Thursday, bringing the nation's total to 1,066,401. There were 636 new fatalities, bringing Italy's death toll to 43,589.
ABC News' Christine Theodorou contributed to this report
Nov 12, 2020, 1:16 PM EST
Corey Lewandowski tests positive
Trump adviser Corey Lewandowski has tested positive for COVID-19, according to a person briefed on the diagnosis.
Lewandowski tested positive for the virus on Wednesday. He has been in Philadelphia this week as the Trump campaign continues to bring lawsuits related to the election results.
President Donald Trump's campaign advisor Corey Lewandowski, center, speaks about a court order obtained to grant more access to vote counting operations at the Pennsylvania Convention Center, Nov. 5, 2020, in Philadelphia. At right is former Florida Attorney General Pam Bondi.
Matt Slocum/AP
Lewandowski was among 400 attendees at an indoor election night party at the White House. Many attendees were not wearing masks or social distancing, including chief of staff Mark Meadows, who also tested positive in the days after the event.
Jeff Miller, a lobbyist and longtime Republican political strategist, has also tested positive for the coronavirus, according to a person familiar with the diagnosis. Miller was also at the election night party at the White House.
At least 15 people in President Donald Trump's orbit have tested positive for COVID-19 since Meadows' diagnosis last Wednesday.
Richard Walters, the chief of staff for the Republican National Committee, has also tested positive for COVID-19, according to an RNC official.
"The RNC is following CDC guidance and notifying staff who came in contact with him," the official said.
Walters has not been to the White House recently.
ABC News' Katherine Faulders contributed to this report
