"I believe it will definitely pose some challenge to our efforts to prevent and control the virus, but as China has experience in preventing and controlling the coronavirus, I fully believe that China will be able to host the Winter Olympics as scheduled, smoothly and successfully," Zhao said.

Beijing is set to stage the Games from Feb. 4 to Feb. 20, without foreign spectators and with all athletes and related personnel contained in a "closed-loop" and subject to daily testing for Coivd-19.

Under its "zero-COVID" policy, China has had what are among the world's strictest Covid-19 prevention measures.