Coronavirus April 15, 2020 1:48 pm 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 1:39 Lawrence police cracking down on illegal dirt bikes 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 2:30 Putting an increase in COVID cases into context 1:41 COVID cluster prompts masking at Beth Israel Deaconess Medical Center 0:50 COVID cluster at hospital prompts return of mask requirement in affected unit