booster

There's serious concern about the effectiveness of vaccines against the omicron strain. But there's also reason to be hopeful — especially for those who've had a booster.

Does a booster shot mean that you can go back to ... normal? Or is there still a newish kind of normal to face?

The companies say a study of more than 10,000 volunteers showed a vaccine efficacy of 95% or greater for people receiving the booster.

After vaccination, antibody levels can help predict how much protection a COVID-19 shot offers, scientists are learning. The finding could speed up the development of future vaccines.

People are doing it. They're telling lies to get shots that have not been authorized. What are the medical, practical and ethical implications?