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 1:31 CDC recommends updated Covid shot for everyone ages 6 months and up 0:52 Lifeguard shortage impacts LA County pool hours 2:17 LA County: Mask Mandate Could Return in Weeks 2:22 Avoiding a COVID Winter Surge