With the rise of omicron came the fall of long-lasting protection from reinfection with the pandemic coronavirus SARS-CoV-2, according to a study published in Nature. Using population-wide data from ...

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 ...

NEW YORK -- Two encouraging studies suggest that people who recovered from COVID-19 had immune responses to the virus long after antibodies faded, even up to one year later. The findings may help put ...

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 ...

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 ...

New guidance backs seasonal COVID-19 vaccination in immunocompromised patients. Read more on timing and risk groups.

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 ...