Currently, COVID-19 cases are on the rise in half of U.S. states, data show. An uptick in transmission fueled by highly contagious new variants is causing an increasing number of Americans to come ...

There is an increase in positive COVID-19 cases across the Bay Area, especially in San Francisco. UCSF's Dr. Monica Ghandi says it's because two new subvariants have come up this season. "The problem ...