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

The Los Angeles County Department of Health updated its COVID-19 safety measures Wednesday and mandated that all of the county's businesses must provide N95 or KN95 masks to employees who work indoors.

"Well-fitting medical grade masks, and surgical masks," are also acceptable under the order.

"Everyone needs to be sensible about how to protect themselves and those they love by layering on protections whenever around non-household members," LA County's health director, Dr. Barbara Ferrer, said in a statement. "At work, this means upgrading your mask if you work indoors and you are in contact with other workers or members of the public."

The Centers for Disease Control and Prevention advisory panel voted Wednesday to approve COVID-19 boosters for 12- to 15-year-olds.

CDC Director Rochelle Walensky will likely to sign off on the move later Wednesday night.

MORE: CDC panel recommends Pfizer boosters for 12-15 year olds, final call expected from CDC director

Shots could go into arms as soon as Thursday morning. The Food and Drug Administration authorized the Pfizer boosters on Monday, paving the way for the CDC’s final green light.

-ABC News' Cheyenne Haslett

The 2022 Grammy Awards have been postponed due to the surge in COVID-19 cases linked to the omicron variant.

"After careful consideration and analysis with city and state officials, health and safety experts, the artist community and our many partners, thx have postponed the 64th Annual GRAMMY Awards Show," CBS and the Recording Academy said in a joint statement.

The statement continued, "The health and safety of those in our music community, the live audience, and the hundreds of people who work tirelessly to produce our show remains our top priority.  Given the uncertainty surrounding the Omicron variant, holding the show on January 31 simply contains too many risks."

A future date for the Grammys has yet to be announced.

The awards show was scheduled to be held at the Arena in Los Angeles and hosted by "The Daily Show's" Trevor Noah.

This is the second year in a row that the Grammys has been postponed. Last year, the show was held in March after its original date was canceled in January.

Illinois Gov. JB Pritzker announced that Abbott Labs will provide Chicago public schools 350,000 COVID-19 tests amid the omicron surge and the impasse between the teacher's unions and the school district to return to classrooms.

"I am committed to seeing our kids and teachers safely in classrooms ASAP. I want to thank the CEO of Abbott, Robert Ford, who was committed to helping get kids back to school by providing rapid antigen tests, along with the team at SHIELD Illinois," Pritzker said in a statement Saturday.

"Together, they turned over every stone ... I appreciate their hard work, along with that of my staff who worked nonstop behind the scene to get this done," he said.

Chicago Public Schools canceled classes last week amid negotiations over remote learning and COVID-19 safety measures.

City leadership, including Mayor Lori Lightfoot, had asked teachers to continue in-classroom instruction, but 88% of the Chicago Teachers Union's leadership and 73% of its members voted last week in favor of remote education.