coronavirus January 27, 2021 8:16 am CDC Provides Updates on COVID-19 Variants Director of the Centers for Disease Control and Prevention Dr. Rochelle Walensky provides an update on COVID-19 variants found in the U.S. 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