https://www.siliconvalley.com/2021/07/22/bay-area-counties-urge-employers-to-require-vaccinations/

Santa Clara, Contra Costa and San Francisco county health officials Thursday urged employers to require their workers to get vaccinated as soon as possible as the Bay Area sees a surge in COVID-19, chiefly among those who’ve not been inoculated.

County health officials said California’s relaxing of community and workplace transmission protections since mid-June and the rapid spread of the more contagious Delta variant of the COVID-19 virus have led to significantly higher case rates and a higher risk of transmission at businesses and workplaces as a result.