The appearance of two bars after five hours of New Crown test strips cannot be judged as positive. The new crown test paper belongs to the antigen detection reagent, generally in fifteen to twenty minutes after the use of the results, the latest not more than thirty minutes. If two bars appear after five hours, the test paper is generally invalid and has no clinical significance, and cannot be accurately judged as positive. You can use the test paper again to test and see the result within thirty minutes, or we suggest to directly carry out the nucleic acid test. If the result of the test paper is one bar within thirty minutes, it is mostly negative, neither infected with the new coronavirus, if there are two bars, it suggests that it is positive. However, antigen test results do not confirm infection with novel coronavirus and should be reported to the community for further nucleic acid testing to confirm the diagnosis. It is recommended to follow the instructions of the test strips strictly to avoid affecting the test results.