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Nine states have active mask mandates, even as the new variant is quickly moving in on the U.S. Despite their political unpopularity, research shows masks still work and could save lives.

A powerful typhoon slammed into the southeastern Philippines on Thursday, prompting the evacuation of nearly 100,000 people. Officials say 10,000 villages lie in the projected path of the typhoon.

The two previously reported cases of the variant were fully vaccinated and received their booster shots, while the four cases reported Wednesday were fully vaccinated but had not received booster shots, according to county records.

A new study from the University of Hong Kong offers preliminary information that could explain why this new coronavirus variant may be more transmissible.

The San Diego Unified School District will provide two COVID-19 rapid tests for all of its students to self-test at home prior to returning to campus after winter break in January, it was announced Wednesday.

Games were postponed in the NHL and NBA as stars were sidelined by COVID exposure, while 94 NFL players tested positive since Monday. Now, leagues are moving to strengthen safety measures.

The Moderna vaccine's ability to shield against infection drops sharply when tested on the omicron variant. But getting a booster pumps the protection back up again, new research suggests.

Vaccines and testing are widely available. So why are some of San Diego’s most vulnerable neighborhoods still dealing with the highest COVID-19 case rates?

"Omicron is spreading at a rate we have not seen with any previous variant," says WHO Director-General Tedros Adhanom Ghebreyesus.

The declines many school districts reported last year have continued, an NPR investigation finds. What educators don't know is where those students have gone.