Coronavirus

A federal appeals court panel has ruled that President Joe Biden’s vaccine mandate for larger private employers can take effect.

Pfizer is testing an extra dose of its COVID-19 vaccine for babies and preschoolers after preliminary research hinted the usual two doses wouldn't be enough.

From small acts of kindness to awe-inspiring events, there were a lot of feel-good moments in 2021.

The Army said 98% of its active-duty force has gotten at least one dose of the mandatory COVID-19 vaccine, as of this week's deadline.

Colleges across the U.S. are starting to require booster shots, extend mask mandates and in some cases revert to online classes as they brace for the new omicron variant.

Medical experts say the omicron coronavirus variant is spreading so fast, surveillance attempts can’t keep up.

Is it COVID-19, the flu or the common cold? Jade Flinn, a nurse educator at Johns Hopkins Hospital’s biocontainment unit, outlines some of the key differences and similarities between the three illnesses.

The mandate requires everyone in California to mask up indoors, regardless of vaccination status, from December 15 through January 15.

Kroger, the country’s biggest traditional grocery chain, is ending some benefits for unvaccinated workers as big employers attempt to compel more to become vaccinated with cases of COVID-19 again rising.

The milestone is a sad ending to a year that held much promise with the arrival of vaccines, and comes as officials around the world are monitoring the spread of the new omicron variant.