Nucleic acid testing currently generally refers to new coronavirus nucleic acid testing, which is usually valid for 1 to 7 days, depending on the severity of the outbreak and related policies in each region. The validity period of the new coronavirus nucleic acid test is determined by the incubation period of the virus, the incubation period of the new coronavirus is from 1 to 14 days, and most of them are between 3 and 7 days, therefore, the nucleic acid test report is usually valid for 7 days in low-risk areas, however, for high-risk areas, because of the relatively high chance of exposure to new coronavirus-infected people, therefore, the nucleic acid test report is usually required to be valid for less than 3 days. Nucleic acid test specimens are usually sputum and nasopharyngeal swabs. Nucleic acid tests are used to determine whether a person is infected with the New Coronavirus because the virus first multiplies in the respiratory system when it enters the human body. A positive test result means that the person is infected with the virus, while a negative test result means that the person is not infected with the virus. After the nucleic acid test, the person should not be taken lightly and should seek immediate medical treatment if symptoms associated with the virus, such as high fever and fatigue, occur in order to avoid contagion.