Nucleic acid testing is not harmful. Nucleic acid is a kind of genetic material in the body, and nucleic acid specimens are collected in more ways, such as pharyngeal swabs, nasopharyngeal swabs, anal swabs and so on. Nucleic acid test is operated by professional health care personnel, before the nucleic acid test, the health care personnel themselves will do a good job of disinfection, the use of disposable consumables, there is no risk of infection, not to mention the risk of cross-infection, and will not form a physical injury to the site of the collection. The person being tested should cooperate with the healthcare personnel in the collection of nucleic acid samples, maintain nasal or oral hygiene, do not mix with food residues, and achieve a 100% pass rate of the samples. If symptoms such as cough, chest tightness, shortness of breath, fever, etc. occur during the epidemic, they should go to a regular medical institution for nucleic acid testing in a timely manner, and at the same time do a good job of personal protection wear a good mask and pay attention to hygiene.