The difference between the antigen test and nucleic acid test of New Crown lies in the way of examination, the principle of detection, the time to produce the result, the specificity and so on. 1. Antigen detection: this test uses nasal swabs, through the antigen-antibody binding reaction in the test strip, the detection principle refers to the use of existing antibodies to detect the antigen of the virus, so that the virus is displayed, thus causing the generation of antibodies to the material. Generally, the result can be obtained in 15-20 minutes, and the specificity can reach 99%. 2. Nucleic acid test: The test consists of three methods, i.e. nasopharyngeal swab, oropharyngeal swab and nasal swab. Nucleic acid test is mainly for the detection of nucleic acid to determine whether there is a viral infection, it usually takes 4~6 hours to get the results, and its specificity is about 100%. To summarize, there is a clear difference between the antigen test and nucleic acid test for new crowns, and you need to choose the appropriate test according to your actual situation. Normally, you need to strengthen your daily life management, do a good job of personal protection, and actively vaccinate.