California's positivity rate drops sharply, a promising indicator for reopening FacebookTwitterEmail The percentage of coronavirus tests that came back positive over the past week has dropped to 3.5%, down from over 11% last month.Stephen Lam / The ChronicleShow MoreShow Less 2of6 Bladimir Maldonado with Unidos En Salud (center) helps a man near an entrance to a rapid COVID-19 testing site at the 24th St. Mission BART Plaza.Stephen Lam / The ChronicleShow MoreShow Less 3of6 4of6 California Governor Gavin Newsom talks to a person that got inoculated with the Moderna Covid-19 vaccine at a vaccination site in Los Angeles on Tuesday. California’s positivity rate has plunged since December — a good sign.Apu Gomes / AFP via Getty ImagesShow MoreShow Less