November 20, 2020 5:53 am Pfizer Files for FDA Approval of Its Vaccine Pfizer said Friday it is asking U.S. regulators to allow emergency use of its COVID-19 vaccine. 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