Primary case of COVID-19 and its occurrence and development evidence

ABSTRACT

Primary case, commonly known as "No. 0 patient", refers to the first person who is infected by a virus or bacterial disease when the epidemic situation spreads. "No. 0 patient" often causes a large-scale outbreak of infectious diseases. Tracing the epidemiology of "No. 0 patient" and the origin of the occurrence and development are helpful to make clear and understand the pathogen of infection. It is of great significance to control the source of infection and prevent the disease. In this study, from the confirmation of the first diagnosis case of COVID-19, the analysis of the earliest outbreak time point and the carding of the occurrence and development time line of COVID-19, the process from discovery to outbreak of COVID-19 is preliminarily restored, which has important reference value for further understanding of SARS-CoV-2 and COVID-19.