Rob Stein

Infections appear to have started to either crest or fall in some parts of the Northeast and mid-Atlantic, but hospitalizations and deaths tend to lag.

Researchers say signs are emerging that the omicron surge may have begun to peak in some parts of the country, and could peak nationally quickly. Others are more cautious.

Some infectious disease experts think there may be something of a silver lining with the omicron surge. It may leave a blanket of enhanced immunity that leaves the virus easier to live with.

The question of what fully vaccinated means might be changing as booster shots are becoming more important. More data, and new policies, are emerging in the U.S. and around the world.

A young Mississippi woman is thriving two years after getting treated for sickle cell disease with the revolutionary gene-editing technique known as CRISPR.

University of Washington research predicts the omicron wave will infect more than 400,000 people a day in the U.S. when it crests in about six weeks.

The omicron variant is now the dominant variant in the U.S. President Biden is set to warn Americans about omicron, and talk about the administration's plans to help areas struggling with the surge.

Scientists are projecting the surge will peak in January. Just how massive it could be depends on how quickly Americans get boosted and change behavior to slow the spread.

First projections of the variant's impact find a range of possibilities, from just a relatively small acceleration of the current trajectory to a big new wave that could rival last winter's surge.

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.

The coronavirus has now killed more than 800,000 people in the U.S., more deaths than any other country has reported. The U.S. also leads the world in diagnosed cases with more than 50 million.

President Biden announced his strategy to deal with COVID-19 throughout the winter months, including getting more people vaccinated and stepping up testing for the virus.

The first case of the omicron variant has been identified in the United States. The case occurred in a traveler who recently returned to California from a trip to South Africa.

What's the U.S. doing to watch out for the omicron variant? Here's the work underway and the challenges that experts say may slow down the country's efforts.

Public health experts worry confusion about boosters may hamper vaccine efforts, breakthrough cases aren't being monitored, and more testing and genetic sequencing is needed to track the new variant.

By the end of the week, the Food and Drug Administration is poised to authorize the Pfizer booster for anyone age 18 and older, who is already vaccinated.

Scientists have begun to find abnormalities in the immune systems of some long-COVID patients that might help explain the syndrome, at least in some people. But there is still much more to learn.

Some experts worry "boostermania" is distracting from the goal of getting tens of millions of unvaccinated Americans their first shots.

The number of people getting boosters every day in the U.S. is more than double the number of people getting their first shot, a win for Biden's booster plan but a loss for greater vaccination goals.

The centers for Disease Control and Prevention issues recommendations for how to mix-and-match COVID-19 boosters — marking the final step for making boosters widely available.