As the coronavirus pandemic continues to wreak havoc around the world, Brazil has the second-highest number of confirmed cases in the world behind the United States. CGTN invites pulmonary and critical care experts from Peking Union Medical College Hospital and Guang'anmen Hospital under the China Academy of Chinese Medical Sciences to exchange experiences with their Brazilian counterparts. 

Dr Zhou Xiang, deputy director of the Critical Care Medicine at Peking Union Medical College Hospital, raises a question about patients who keep testing positive after treatment and how to treat them.