https://www.mercurynews.com/2020/04/21/coronavirus-earliest-covid-19-deaths-in-bay-area-occurred-in-february-not-march/

Two individuals who died in Santa Clara County in February had tissue samples that tested positive for COVID-19, health officials learned Tuesday, revealing the novel coronavirus was responsible for deaths in the Bay Area earlier than medical officials initially believed.

County Executive Jeff Smith confirmed the test results were received Tuesday from the Centers for Disease Control and Prevention, after being sent to the federal agency by the Medical Examiner-Coroner.