There is no clear rule on how many days a new crown nucleic acid is usually done; for high-risk areas or close contacts, the test is usually done once a day. If there is no history of high-risk exposure, the timing of the nucleic acid test is chosen based on the specific needs of the individual, usually every three days or weekly. Nucleic acid testing is done by selecting secretions from the patient’s mouth and throat. If the nucleic acid test is negative, it means that the patient is not infected with the novel coronavirus for the time being. In general, if the patient is in a high-risk area and positive infections have been detected in the surrounding area, testing is usually done once a day so that potential infections can be detected in a timely manner. Daily safety testing is also recommended if the patient has not recently lived in a high-risk area but may have had close contact with an infected person. If there is no history of high-risk exposure, the timing of the nucleic acid test can be chosen according to the specific needs of the individual, usually every three days or once a week. As for the frequency of nucleic acid, patients are advised to consult their local prevention and control authorities to determine the frequency of nucleic acid collection based on specific requirements.