LOS ANGELES (AP) — California broadly reopened its economy barely two weeks ago and since then an especially contagious coronavirus variant has spread among the unvaccinated, a development that has ...

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 ...

As winter settles in Central California, health professionals are raising alarms about a severe new strain of influenza and a resurgence of respiratory syncytial virus (RSV) among children. With the ...

SAN FRANCISCO -- A case of the coronavirus variant was detected in Southern California Wednesday, while a second suspected case has been identified in Colorado. According to officials, the COVID-19 ...

Researchers at Stanford (Calif.) Clinical Virology Lab have confirmed one case of a coronavirus variant, first detected in India, that carries two mutations, the San Francisco Chronicle reported April ...

California has added a million new coronavirus infections in less than four weeks. The state became the first in the country this week to record three million total coronavirus infections since the ...