Asymptomatic infected persons currently identified as carrying and transmitting novel coronavirus are primarily close contacts of patients with novel coronavirus pneumonia who may have a history of travel or residence in Wuhan, Hubei Province or Wenzhou City, Zhejiang Province, within the past 14 days, or who have been in contact with related patients in the community where the case was reported, or who have had a cluster of family cases occurring around them. Such patients should promptly report to the community or local CDC, truthfully report the past 14-day exposure history, and undergo appropriate medical observation. At the same time, go to the hospital for nucleic acid tests, chest CT, and blood tests to check for new coronavirus infection.