Editor's note: Find the latest COVID-19 news and guidance in Medscape's Coronavirus Resource Center. At a recent town hall meeting in Cincinnati, Ohio, President Joe Biden was asked about COVID-19 ...

LAS VEGAS, NEVADA -- A California couple says they were fully vaccinated, but still contracted COVID-19 while on vacation as experts say breakthrough cases are possible, especially with the delta ...

NEW YORK -- As Americans brace for the possibility of another difficult winter ahead in the nation's fight against coronavirus, there is a renewed sense of urgency to get as many people inoculated and ...

South Carolina is not tracking mild coronavirus infections among fully vaccinated residents, even though new research has suggested that inoculated people can contract and spread the super-contagious ...

MARIN COUNTY, Calif. -- As the Delta variant spreads, we are learning more about breakthrough COVID-19 cases. Numbers from California's state health department help put into perspective what the ...

The true prevalence of breakthrough COVID-19 cases is difficult to track due to a lack of comprehensive testing and surveillance, but a new analysis from The Wall Street Journal suggests infections ...

Professional sports leagues are uniquely positioned to track breakthrough Covid cases because they test thousands of athletes consistently, according to Dr. Robby Sikka, a physician who has worked ...