摘要
Clinical trials for COVID-19 vaccines get underway Each spring,when the cherry blossom season arrived,Ren Chao would be busy receiving tourists visiting the ca m pus of Wuhan University in Hubei Province,central China.But this year,the 36-year-old's work has changed dramatically.When the novel coronavirus disease(COVID-19)broke out in the city of Wuhan,he began to work on prevention and control on cam pus.
