LONDON — As more cases of the new omicron Covid variant emerge around the world, experts say it's likely that the variant, first identified in South Africa last week, had already been circulating for ...

The race is on for new treatments that stand up to omicron's explosive spread. With omicron's explosive spread threatening to outpace current COVID-19 treatments, the race is on to find new options ...

White House medical adviser Dr. Anthony Fauci said Tuesday that just about everyone in the U.S. will likely be exposed to the omicron variant at some point in the near future. "I think, in many ...

WASHINGTON -- As the "extraordinarily contagious" omicron variant surges across the United States, Dr. Anthony Fauci warned that COVID-19 cases will likely continue to climb. "Every day it goes up and ...

WASHINGTON -- President Joe Biden plans to announce on Tuesday that his administration will distribute 500 million free at-home rapid tests to Americans beginning in January to combat the surging ...

SAN FRANCISCO -- Preliminary data out of South Africa is giving the world insight into how strong omicron really is. The South African Medical Research Council just reported this variant may cause ...

NEW YORK -- What are the symptoms of omicron? Health experts still don't know if the new variant is causing milder COVID-19, but more indicators are emerging. The World Health Organization's top ...

Neutralizing antibody levels rose 37-fold one month after the booster was given. Moderna announced Monday that its COVID-19 vaccine booster increases antibody levels against the omicron variant within ...

During surges, the differences in case rates between in-center and home patients were more apparent than during non-surge weeks for all variant-dominated periods.

The immune system’s first encounter with a virus or vaccine establishes a “starting template” that shapes its response to new ...