coronavirus July 25, 2021 11:51 pm All San Mateo County Buildings to Require Face Masks On the Peninsula, San Mateo County takes its own action Monday to fight the surging Delta variant. Thom Jensen reports. US & World Videos 2:19 San Francisco barbershop struggles to stay open after pandemic 0:51 Alameda County using dogs to detect COVID 3:57 Interview: Doctor's perspective on COVID 4 years after shutdown started 2:27 Marking 4 years since COVID-19 shut down the Bay Area 2:09 CDC updates COVID isolation guidelines