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 ...

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 ...

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 ...

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 ...

The CDC reports the delta variant of the coronavirus is surging in the U.S. and now accounts for about 83% of new COVID-19 cases. Director of the CDC, Dr. Rochelle Walensky shared the data during a ...

With the more contagious delta variant strain of COVID-19 spreading throughout the country, hospitalizations and deaths from the virus are on the rise. According to the Centers for Disease Control and ...