COVID-19 is a new virus, which appeared in 2002. It first appeared in Wuhan, China. Then it gradually spread to the whole country and even the whole world. This is a public health emergency. After this novel coronavirus infects the human body, it may cause fever. Sometimes it's a low fever, sometimes it's a high fever. There will also be symptoms of respiratory infection. For example, coughing and expectoration, sneezing, and sometimes coughing up white sputum. Because novel coronavirus is a viral disease, there is no specific treatment. The treatment of this disease is mainly symptomatic supportive treatment. Generally speaking, the treatment takes about 7~ 14 days. However, some people may have complications, in which case they may receive treatment for a longer period of time. Because it is a viral disease, it is self-limited, and it will heal itself in about 1~2 weeks. But sometimes it leads to death. Novel coronavirus vaccine has been developed. This novel coronavirus vaccine can effectively avoid novel coronavirus infection. Antibodies against novel coronavirus can be produced.