coronavirus May 7, 2021 7:59 am San Francisco Moves Into Yellow Reopening Tier Nearly every business in San Francisco is able to loosen COVID-19 restrictions now that the city is in the yellow reopening tier. Raj Mathai 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