coronavirus April 15, 2020 10:48 am China Begins Second Phase of Coronavirus Vaccine Trial China’s Academy of Military Medical Sciences began the second phase of a clinical trial on Sunday for a coronavirus vaccine. 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