New coronavirus nucleic acid test can not be self-test, self-test should be the use of new coronavirus antigen test kit for self-test, if the self-test results are weakly positive, may be infected with the new coronavirus, you should improve the nucleic acid test to confirm the diagnosis. New coronavirus antigen self-test is usually the subject himself using a sampler, collect their own nasopharyngeal or oropharyngeal mucosal secretions, and then the head of the sampler immersed in the virus preservation liquid, and finally the preservation liquid drops in the test card, if the results of the test is weakly positive, may be infected with the new coronavirus. As the self-test of new crown antigen is to detect the viral antigen, if the patient is in the early stage of infection, the viral load is not much, and accordingly the amount of viral antigen in the patient’s mucous membrane secretion is relatively small, so the result will be weakly positive; if the self-test finds weakly positive, please report to the local epidemic prevention department or the community in time, and improve the nucleic acid test to confirm the diagnosis.