aerosol propagation. According to the query of Sohu News Network, the earliest case of COVID-19 epidemic in Guangzhou was Guo Apo who was diagnosed on May 21st, 221. Combined with the previous Caixin reports, it can be found that Guo Apo went to the Chinese medicine clinic of Liwan Central Hospital, and the window interval between her and the fever clinic where an imported case of Saudi Arabia stayed in Guangzhou was only 77 cm. However, the above-mentioned two infected people have overlapping time and space, and their gene sequences are highly homologous. Therefore, Chinese disease control experts say that Guo Apo is an aerosol-transmitted infection.