Title : Understanding of COVID-19 based on current evidence Running head : Current understanding of COVID-19

Since December 2019, a series of unexplained pneumonia cases has been reported in Wuhan, China. On January 12, 2020, the World Health Organization (WHO) temporarily named this new virus as the 2019 novel coronavirus (2019-nCoV). On February 11, 2020, the WHO officially named the disease caused by the 2019-nCoV as Corona Virus Disease (COVID-19). The COVID-19 epidemic is spreading all over the world, especially in China. Based on the published evidence, we systematically discuss the characteristics of COVID-19 in the hope of providing a reference for future studies and help for the prevention and control of the COVID-19 epidemic.