The thinking about what risk Covid poses — or doesn't pose — has shifted in recent years. What does it mean for you?

Many countries including Canada and the U.K. have backed mix-and-match strategies for the widely-used AstraZeneca-Oxford vaccine, which is not authorized in the United States but is based on similar ...

Add Yahoo as a preferred source to see more of our stories on Google. Looking to get a COVID-19 vaccine booster for yourself or your child this fall? It may be a bit more complicated than just making ...

CNN — As the Covid-19 vaccine rollout continues in the United States, with people ages 12 and older receiving their shots, vaccine makers are now preparing for a next possible phase: booster doses.

NEW YORK -- This holiday season held promise for Americans, many of whom spent Christmas 2020 in quarantine or away from loved ones due to a nasty winter COVID-19 surge. Yet in the last week or so, ...

Covid vaccines continue to protect against serious illness and death, especially for people ages 65 and older, although the benefits for younger adults are not as clear, according to a large new study ...

COVID booster vaccinations reduced the likelihood of hospitalization related to COVID in patients with autoimmune diseases, with monovalent and bivalent booster vaccines showing 38% and 32% ...

WASHINGTON -- With winter closing in and coronavirus case rates creeping up once again, White House chief medical adviser Dr. Anthony Fauci is warning that the vaccines' waning immunity combined with ...

The vaccine is available to people aged 75 and over, resident of a care home for older adults, and people aged six months and older who ...

Research continues to be carried out on long Covid, which occurs when the symptoms of Covid last longer than 12 weeks, and ...