Since December 2019, many patients in Wuhan sustained pneumonia with unknown causes. A part of severe patients developed acute respiratory distress syndrome or septic shock, and even death. On January 7, 2020, Chinese researchers have for the first time detected a new coronavirus. On January 20, 2020, the National Health Commission issued Announcement No. 1 of 2020, which included the new coronavirus pneumonia as a Class B infectious disease, and conducted epidemic prevention and control according to the Class A infectious disease. This new kind of pneumonia has been named coronavirus disease 2019 (COVID-19). The sixth edition of “Diagnosis and Treatment Scheme for New Coronavirus Infected Pneumonia” points out that the main transmission routes include respiratory droplets and close contact transmission. There is a possibility of aerosol transmission in a relatively closed environment with prolonged exposure to high concentrations of aerosol. New coronavirus pneumonia has a certain incubation period.
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