Ian Haydon helped test Moderna's coronavirus vaccine last year. Now, he's helping test the tweaked version of that vaccine designed to fight a new, more contagious variant. "A year ago I tried the ...

On December 18, a San Diego emergency room nurse was given a shot of the COVID-19 vaccine. A week later, he tested positive for the virus, CNN affiliate KGTV reported. Stories like this will become ...

In October, the Centers for Disease Control and Prevention recommended that high-risk adults get a second updated Covid vaccine to bolster their protection against the virus. No other vaccines are ...

LOS ANGELES - New data released by Moderna on Wednesday found that people who were vaccinated more recently had greater protection from breakthrough COVID-19 cases caused by concerning variants of the ...

DEAR DR. ROACH: My daughter was recently visiting and tested positive for COVID. Since my last COVID vaccine was eight months ago, I searched for how much protection I still had and understood the ...

Women who are vaccinated against COVID-19 during pregnancy provide their infants with protection against the coronavirus for at least six months after birth – the point when babies are eligible to get ...