COVID-19 updates: Classes in Chicago canceled for 4th day

Chicago Public Schools has been in talks with teachers over COVID-19 safety.

As the COVID-19 pandemic has swept the globe, more than 5.4 million people have died from the disease worldwide, including over 837,000 Americans, according to real-time data compiled by Johns Hopkins University's Center for Systems Science and Engineering.

About 62.5% of the population in the United States is fully vaccinated against COVID-19, according to data from the Centers for Disease Control and Prevention.


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Chicago cancels school for 2nd day

Officials in Chicago canceled all public school classes on Thursday amid discussions about classroom safety with the city's teachers.

Classes had been canceled on Wednesday after a majority of the Chicago Teachers Union's membership voted in favor of remote learning during a surge in COVID-19 cases. School officials called their action an illegal strike.

"In a time of crisis related to this pandemic, the worst possible thing we can do is abandon the science and data," Mayor Lori E. Lightfoot said on Twitter. "If you care about our students and families as we do, we will not relent. We are standing firm and fighting to get our kids back to in-person learning."

Teachers were locked out of their remote classrooms on Wednesday, according to the union. Union leaders asked members to again try to log in on Thursday, urging them post photos on social media.

The union on Wednesday filed an unfair labor practice charge against the Chicago Board of Education.

"We have rights to safety and we’ve been at the bargaining table for 20 months to secure those rights," Jesse Sharkey, the union's president, said in a statement.

Chicago Public Schools are among the largest in the country, with about 340,000 students in 636 schools.


TSA reports more than 3,000 employee cases

The Transportation Security Administration reported 3,037 current COVID-19 infections on Wednesday.

The agency's infections have increased by about 16% in two days, according to TSA data.

The agency, which employs about 60,000, said it's had a cumulative 15,191 COVID-19 cases. The agency said 12,154 employees have recovered and 33 have died.

ABC News' Sam Sweeney


CDC signs off on Pfizer boosters for 12- to 15-year-olds

The director of the Centers for Disease Control and Prevention has given the final go-ahead for children ages 12 to 15 to get Pfizer's COVID-19 booster.

"It is critical that we protect our children and teens from COVID-19 infection and the complications of severe disease," CDC Director Rochelle Walensky said in a statement endorsing the CDC advisory panel's recommendation to expand booster eligibility.

The CDC recommends that adolescents between the ages of 12 and 17 get a Pfizer booster five months after their second dose.

-ABC News' Cheyenne Haslett


Every cruise ship operating in US with passengers has COVID-19 cases: CDC

COVID-19 cases have been reported on every cruise ship operating in U.S. waters with passengers, according to the U.S. Centers for Disease Control and Prevention.

More than 90 ships are currently being investigated by the CDC or have been investigated and are still being observed by the agency.

In order to meet the threshold for a CDC investigation, a ship must report COVID-19 cases in more than 0.10% of passengers or have a single crew member test positive in the previous seven days.

The only ships in U.S. waters that have not met this criteria, according to the CDC, only have crew members on board.

-ABC News' Mina Kaji