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 ...

A delta breakthrough infection generates a potent and broad neutralizing antibody response in double vaccinated individuals, according to new research. The findings were published this week in mBio, ...

In a recent study published on the preprint server medRxiv*, researchers compare the neutralizing ability of antibodies induced by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) ...

ST. PAUL — Minnesota is seeing dramatic growth in breakthrough cases of the coronavirus, adding to evidence that vaccines wear off over time and may be less effective against the now dominant delta ...

In an interview with WRAL News, Dr. Anthony Fauci said the Delta variant will cause some breakthrough cases in vaccinated people, but he doubts the CDC will issue a central recommendation for ...

Delta CEO Ed Bastian on Tuesday asked the Centers for Disease Control and Prevention (CDC) to shorten quarantine guidelines for breakthrough cases of COVID-19 in people who are fully vaccinated. Delta ...

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 boosted as ...

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 ...