New crown antigen weakly positive nucleic acid negative considerations are the cause of false-positive antigen test, may be related to improper testing methods, poor product quality, vaccination and other factors. 1. Inappropriate testing methods: If in the process of antigen testing, there are not in accordance with the instructions of the reagent for the corresponding sample sampling, sampling snot is not wiped clean, etc., then it is easy to affect the test results, false-positive situation. 2. Poor product quality: Due to production problems, antigen detection reagents produced by different manufacturers have different target sites for antigens, so false positives may exist when the same sample is tested in reagents from different manufacturers. 3. Vaccination: Studies have shown that false positives may occur if antigen testing is performed right after inactivated vaccination, so it is generally recommended that antigen testing be avoided for 48 hours after vaccination. In conclusion, if the examiner disagrees with the antigen test and nucleic acid test, he/she should go to the hospital for further refinement of the relevant examinations to clarify the specific cause.