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 ...

It was just over six weeks ago that California reopened, the statewide mask mandate was lifted and Governor Gavin Newsom began proudly claiming California is roaring back. But as cases now continue to ...

The Centers for Disease Control and Prevention listed the COVID-19 delta variant as one of its "variants of concern" (VOCs) on June 15. According to the CDC, VOCs can be more contagious, more ...

SAN FRANCISCO (KGO) -- Bay Area doctors and health officials are concerned about the rapid spread of the COVID-19 Delta variant, warning significant outbreaks could trigger a setback for the state.

SAN FRANCISCO -- The Delta variant now accounts for more than 51% of new COVID-19 cases across the country. Los Angeles County public health officials recommend everyone wear masks inside regardless ...

The mask mandates have provoked outrage. One town councilman in California even called the policy "BS" and vowed not to enforce it.

SAN FRANCISCO -- Preliminary data out of South Africa is giving the world insight into how strong omicron really is. The South African Medical Research Council just reported this variant may cause ...

SAN FRANCISCO -- The R1 variant is the new strain of COVID-19 researchers are keeping a close eye on. The CDC identified "multiple spike protein mutations" in this variant. "The R.1 variant does carry ...

Hospital officials said the vast majority of those staff members were vaccinated and most were cases of the highly contagious Delta variant.