Top adviser warns China vulnerable to second wave

China still faces the "big challenge" of a potential second wave of Covid-19 infections, the country's top respiratory authority has warned, with the lack of immunity among the community a serious concern as the race to develop a vaccine continues. CNN's David Culver has the exclusive interview with Dr. Zhong Nanshan.

source https://www.cnn.com/videos/world/2020/05/17/china-coronavirus-second-wave-culver-exclusive-pkg-vpx.cnn