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Underscoring its high transmissibility, in a week, omicron went from a 12.6% share of new COVID infections in the U.S. to a dominant 73.2%, according to the CDC's latest estimates.

China on Sunday reported two additional deaths from COVID-19 as some cities move cautiously to ease anti-pandemic restrictions following increasingly vocal public frustrations.

North Korea says it's experiencing its first COVID outbreak. Experts are skeptical, but they are also wondering if this means the country will accept outside help or if it can handle it alone.

If all goes to plan, Americans who got Pfizer or Moderna shots can get a third dose eight months after their last jab. Here's why health officials think you'll need one.

As the delta variant takes over in the U.S., new, localized outbreaks are emerging. Those surges are likely driven by pockets of dangerously low vaccination rates.

This week, the Centers for Disease Control and Prevention ended the COVID-19 testing rule for air passengers traveling to the U.S. from abroad. Should you still take a COVID test anyway?

An analysis by NPR shows that since the vaccine rollout, counties that voted heavily for Donald Trump have had more than twice the COVID mortality rates of those that voted for Joe Biden.

KSFR News Director Tom Trowbridge speaks with Andy Lyman of

Results from the governor's rapid test Tuesday morning came back negative. However, results from his PCR test came back positive, according to a statement.

The financial gap between wealthy hospitals and safety-net hospitals, which take everyone who walks through their doors, has widened during the pandemic, an NPR and PBS Frontline investigation found.