1. Coronavirus is a very large virus, which is known to cause diseases. Symptoms of patients vary from the common cold to severe lung infections, such as Middle East Respiratory Syndrome (MERS) and Severe Acute Respiratory Syndrome (SARS).

2. novel coronavirus (nCoV) is a kind of novel coronavirus that has not been found in humans before, such as novel coronavirus 20 19-nCov in Wuhan, China.

3. The symptoms of infection depend on the type of virus and the patient's own physical condition, but the common symptoms include respiratory symptoms, fever, cough, shortness of breath and dyspnea. In more serious cases, infection can lead to pneumonia, severe acute respiratory syndrome, renal failure and even death.

Novel coronavirus spreads from person to person, and there is an incubation period between people. The incubation period of onset varies with individual constitution, which may be 3 ~ 7 days, and generally does not exceed 14 days.