4 Min Read SACRAMENTO, Calif. (Reuters) - A California community that has been a bellwether of the coronavirus pandemic’s rampage across the United States warned on Thursday that the number of cases of more contagious COVID-19 variants is increasing to worrisome levels. FILE PHOTO: Lynda Barbieri, a Santa Clara County resident, holds her blouse sleeve after being inoculated against the coronavirus disease (COVID-19) by clinical nurse Lynette Ancheta at a vaccination site run by the Santa Clara County health department at Levi's Stadium, home of the San Francisco 49ers NFL football team, in Santa Clara, California, U.S. February 9, 2021. REUTERS/Brittany Hosea-Small