Add Yahoo as a preferred source to see more of our stories on Google. The director of the C.D.C said Friday there may be a need to "update our definition of fully vaccinated in the future" as more ...

But the federal government has "tied a lot of decisions to the definition of what it means to be fully vaccinated, and changing that definition is a difficult endeavor, at least from their perception, ...

Add Yahoo as a preferred source to see more of our stories on Google. Social worker Jonathan De La Rosa gets a COVID-19 booster shot at a drive-up vaccination site in Mesquite, Texas. Some scientists ...

Dr. Anthony Fauci has cautioned that health officials may change the definition of "fully vaccinated" to include COVID-19 booster shots – if the data suggests it. The Centers for Disease Control (CDC) ...

CNN — The US Centers for Disease Control and Prevention might consider redefining what it means to be "fully vaccinated" against Covid-19 to include a third dose of vaccine -- but the question is when ...