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 ...

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 ...

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 ...

Sustained protection through 6 months, but effectiveness slipped as newer strains emerged ...

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 ...

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 ...

New data released Thursday by the Centers for Disease Control and Prevention suggest that the most recent Covid-19 booster offers about 54% percent protection against infection with the virus. A study ...