Nucleic acid testing generally refers to the test to check whether the new coronavirus infection, because the incubation period of the new coronavirus is usually in 3-7 days, so it is necessary to perform nucleic acid testing every 7 days, that is, nucleic acid test results 7 days will be more effective. However, the incubation period may be extended to 14 days or longer in some cases, and shortened to 1 day in others, so the validity of nucleic acid test results for 7 days is not absolute, and the shorter the interval between nucleic acid tests, the higher the accuracy. Since nucleic acid testing is also influenced by a history of exposure to patients with new coronary pneumonia, a history of living in high-risk areas, and the incubation period of the virus, the validity period of nucleic acid testing sometimes changes depending on the circumstances. If you come into contact with a person with NCCV or suspected NCCP within 7 days of having a nucleic acid test, you should immediately report the case for isolation and need to have a new nucleic acid test done every 24 hours during the isolation period. If you have been to a high-risk area, you should immediately report the quarantine and have nucleic acid testing done immediately and every 2 days during the quarantine period. In order to control the spread of infectious diseases and your own health, it is recommended that you actively cooperate with nucleic acid testing, go to crowded areas as little as possible, wear a mask when traveling, isolate at home during special periods, and report infections for treatment in a timely manner.