The onset of the disease after infection with New Crown is mostly within 3~7 days, but the incubation period of New Crown virus can be 1~14 days, and the onset of the disease after infection is usually within 14 days. Infection with New Crown virus does not show symptoms during the incubation period. After the onset of the disease, fever, dry cough and malaise without any cause are the first symptoms, and some people may show respiratory symptoms such as runny nose and nasal congestion. There is also a portion of patients who are asymptomatically infected and may not show symptoms. After the onset of the disease, the symptoms of severely ill patients gradually worsen and serious life-threatening complications such as multi-organ dysfunction occur. However, due to the vaccination of the New Crown vaccine, at present, the risk of severely ill patients and fatalities have been substantially reduced, therefore, no special circumstances, it is important to be vaccinated. In your life, take care to avoid congregate activities, wear a mask and wash your hands frequently. It is worth noting that a longer incubation period cannot be ruled out due to the presence of mutated strains of the new coronavirus. Therefore, any possible close encounters should be reported promptly and isolated as well as nucleic acid testing should be performed as required.