coronavirus March 16, 2020 12:47 am Coronavirus Latest: Businesses Close, At-Risk Residents Urged to Stay Home NBC Bay Area’s team brings you the latest on the coronavirus, including businesses closing, at-risk residents asked to stay home and more. 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