SAN FRANCISCO (KGO) -- 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 ...

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 ...

TULARE COUNTY, Calif. (KFSN) -- With around two thirds of Tulare County residents not vaccinated and COVID-19 cases on the rise, county health officials say the dominant Delta variant of the ...

As summer comes to an end, COVID-19 cases are on the rise again in California. While respiratory viruses usually peak in the winter, the novel coronavirus can also surge in the warmer months.

COVID-19 is once again climbing to troubling levels in California — a worrying trend as health officials attempt to navigate a vaccine landscape thrown into uncertainty by delays and decisions from ...

The new XFG "Stratus" COVID-19 variant is now the dominant strain in the U.S. The new strain is driving a recent rise in cases across several states, including California. The variant, a hybrid of two ...

During Delta, there were days with more than 2,000 coronavirus-positive patients ... During both Delta and the initial Omicron surge, California “carefully evaluated the unique characteristics of each ...

A third dose of the Pfizer/BioNTech COVID-19 vaccine can "strongly" boost protection against the delta variant -- beyond the protection afforded by the standard two doses, suggests new data released ...

Estimates show the variant accounts for over 51% of all new cases nationwide. A highly contagious variant of the novel coronavirus that was initially identified in India is now the dominant strain in ...

RALEIGH, N.C. (WTVD) -- North Carolina, like many other states across the country, is seeing an uptick in COVID-19 cases. 5:45 p.m. Angelene Mcrae has oxygen tanks and other pieces of equipment that ...

The delta variant of the coronavirus is increasing its hold on North Dakota, helping push active COVID-19 cases near 1,500 and virus-related hospitalizations over 50. Active cases statewide on Friday ...