In the case of neo-coronavirus antigen testing, for example, the first positive antigen test and the second negative test do not necessarily mean that the test is positive, in which case it may be due to inaccurate testing. Taking the new coronavirus pneumonia as an example, the antigen test is more convenient but less sensitive than the nucleic acid test, so there may be false-positive or false-negative results. 1. False positives: If the first test is false positive due to contaminated samples, incorrect sampling process, improper operation, etc., and the virus is not actually infected, then the re-test is negative, and the situation described in the question above occurs. At this point is not infected with the virus, not a new crown positive. 2. False-negative: If you are actually infected with the virus and test positive for the new crown antigen, and the second test is false-negative due to incorrect handling, etc., then the above scenario can also occur. No matter which situation, as long as the two results are inconsistent, the detector needs to report to the epidemic prevention department as soon as possible and nucleic acid test, the final nucleic acid test results shall prevail. Tip: “New coronavirus pneumonia” and “new coronavirus pneumonia” mentioned in this article were renamed to “new coronavirus infection” on December 26, 2022, as announced by the National Health Commission.