The symptoms caused by novel coronavirus infection are mainly fever, malaise and dry cough as typical symptoms, some people will have upper respiratory symptoms such as nasal congestion, runny nose, sore throat and muscle aches, and some people have mainly gastrointestinal symptoms such as diarrhea. Symptoms such as headache, nasal congestion, chills, fever, cough, muscle aches and pains appear. The new coronavirus has a long incubation period and can develop within 1-14 days, but it is still highly contagious during the incubation period; the SARS virus is highly contagious only after symptoms appear; the common cold is less contagious, and only the influenza can infect colleagues or family members around, which is not very contagious.