coronavirus January 29, 2021 9:01 am COVID Mutations in LA Likely Happening in Other Cities NIAID Director Dr. Anthony Fauci describes how large outbreaks of COVID-19 in a city can lead to new variations. 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