Client of Chinanews.com (Peng Jingru) On the evening of April 2, Li Lanjuan, member of the Chinese Academy of Engineering, participated in the Xinguan Epidemic Prevention and Control International Sharing Conference remotely via video, and introduced the time window for Xinguan patients to progress to severe and critically severe. She said that the second week of onset is the key window for disease progression, and the key factor for the second week's exacerbation is the critical illness caused by the discovery of the key pathogenesis of the "cytokine storm" and the occurrence of multiple organ failure.