Rochelle Walensky, the director of the Centers for Disease Control and Prevention, said earlier this week that she expects the delta variant to become the dominant coronavirus strain in the United ...

SAN FRANCISCO (KGO) -- The Centers for Disease Control and Prevention (CDC) released new data Friday indicating the Delta variant is twice as infectious as previously thought, and a recent analysis ...

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 World Health Organization urged vaccinated people around the world to continue to "be appropriately cautious" when it comes to the transmission of COVID-19, especially the rising delta variant.

Some experts are calling for people who were vaccinated with Johnson & Johnson's COVID-19 vaccine to get a booster shot of an mRNA vaccine from either Pfizer or Moderna to protect against the delta ...

When the Delta variant was dominant in the United States, both vaccination and prior infection helped protect against Covid-19, but vaccination was the safest way to be protected, according to a study ...

Since the CDC limits data reporting on breakthrough COVID-19 infections — those occurring among fully vaccinated people — to those that cause severe disease, mild or asymptomatic infections caused by ...

As the delta variant continues to spread in countries around the world, some COVID-19 safety restrictions have been reinstated in efforts to curb the rising cases. But the director of the U.S. Centers ...

The outbreak of coronavirus infections, including COVID-19 vaccine breakthrough infections, is associated with large public gatherings, including one in Barnstable County, Massachusetts, according to ...

The delta variant is fueling the COVID-19 surge in the United States, but experts warn that a more dangerous variant could emerge if more Americans don't get vaccinated. Delta is the most recent of ...

TEMPLE, Texas — A Central Texas man and Army veteran is fighting for his life at Baylor Scott and White Medical Center in Temple after he contracted the Delta variant of COVID-19. Longtime friend Lisa ...

The Delta variant, also referred to as a "double mutant" because it carries two mutations, is 55 per cent more transmissible ...