The Delta variant, which was first detected in India, has prompted recent calls from President Joe Biden and Anthony Fauci for more Americans to get vaccinated.

Doctors say the Delta variant could create clusters of new coronavirus cases after the holiday weekend. SAN FRANCISCO (KGO) -- Last summer there was a surge in COVID cases.

Delta variant: CDC says vaccinated people can transmit 'same amount of virus' as those unvaccinated "I'm not sure I see a way out of this short of going back to an indoor mask mandate 100 percent ...

Newly published details of the Provincetown outbreak indicate that the now-dominant delta variant may be able to spread among fully vaccinated people.

A Boston University professor explains why Delta has made it mathematically impossible to beat coronavirus now with just the vaccine.

The fast-spreading delta variant has become a concern. Doctors say for every person infected with the variant, they are likely to infect six more.

Newly updated CDC data shows the so-called delta variant was estimated to account for 51.7% of all new cases of COVID-19 across the country as of July 3.