New coronavirus pneumonia is not infectious, the main source of infection of new coronavirus pneumonia is the new coronavirus infection of patients and asymptomatic infected persons, highly contagious, in the incubation period is infectious, so once found asymptomatic infected persons, need to be concentrated isolation observation. Asymptomatic infections should be concentrated isolation medical observation for 14 days, in principle, two consecutive specimens, sampling nucleic acid interval of at least 24 hours, nucleic acid test is negative, can be released from concentrated isolation medical observation. Nucleic acid test is still positive, and no relevant clinical manifestations, need to continue to focus on isolation medical observation, during the observation period for two consecutive negative nucleic acid test, can be released from centralized isolation medical observation. During the period of centralized isolation medical observation, blood routine, CT imaging and antibody detection should be carried out, meet the diagnostic criteria, timely revision as a confirmed case, such as the emergence of clinical manifestations, should be immediately transferred to the designated medical institutions for standardized treatment, lifting which isolation medical observation of asymptomatic infected, should continue to carry out 14 days of home medical observation, and in the second and fourth week to the designated medical institutions Follow up medical treatment.