coronavirus April 9, 2020 4:43 pm Dr. Birx Encouraged By Low COVID-19 Attack Rates in D.C., Philly Dr. Deborah Birx says she has been encouraged with the low attack rates of COVID-19 in the newer outbreaks in areas like Washington, D.C., and Philadelphia. 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