China's State Council Information Office holds a news conference on origin-tracing of COVID-19. Xu Nanping, vice minister of Science and Technology, Zeng Yixin, vice minister of the National Health Commission, Wang Chen, academician of the Chinese Academy of Engineering, Liang Wannian, team leader of the Chinese Side of the joint expert team of WHO-convened Global Study of Origins of SARS-CoV-2, and Yuan Zhiming, director of the National Biosafety Laboratory, address the conference.