New Coronavirus can be detected by nucleic acid during the incubation period. The incubation period of the new coronavirus is a period of time during which the virus reproduces in the body, and usually patients do not have any symptoms to show during the incubation period. When the new coronavirus infects the human body, the first to reproduce in the respiratory tract, the incubation period of respiratory secretions, including oropharyngeal or nasopharyngeal secretions there is also the virus, although the viral load is low, but there is also the possibility of detecting viral nucleic acid, especially in the later stages of the incubation period, the detection rate of the virus will be higher. Neocoronaviruses are contagious, with an incubation period of generally 1 to 14 days, and are most contagious within five days of onset of illness. It is recommended that if there is a history of close contact with neocoronaviruses, multiple nucleic acid tests should be performed to rule out infection, and that precautions should be taken to prevent spread of the disease by leaving the house as little as possible, and by wearing a good facemask.