COVID-19 March 15, 2024 7:43 am Interview: Doctor's perspective on COVID 4 years after shutdown started UCSF infectious disease specialist Dr. Peter Chin-Hong addresses where we are now four years since the start of the COVID-19 shutdown. US & World Videos 2:19 San Francisco barbershop struggles to stay open after pandemic 0:51 Alameda County using dogs to detect COVID 2:27 Marking 4 years since COVID-19 shut down the Bay Area 2:09 CDC updates COVID isolation guidelines 1:51 SF public health department to close COVID-19 community testing, vaccination sites