For now, antigen generally refers to the Neocoronavirus antigen test. The antigen test for the common cold does not show two lines, but two lines means that the antigen test is positive and that you may be infected with the new coronavirus. A positive antigen test is indicated by the presence of a color band at both the “C” and “T” marks of the antigen test. The viruses that cause colds are different from those that cause neocoronaviruses, and the antigen test is usually referred to as a test that focuses on neocoronaviruses, so a common cold will not affect the results of the test. However, antigen testing can be affected by many factors, so further testing is needed to avoid false positives, which can be reviewed with nucleic acid testing. When conducting antigen detection, it is necessary to strictly follow the instructions, to avoid contamination of the kit, and to achieve accurate sampling posture and sampling in place. When testing, the results should be checked about 15 minutes after the sample is dropped into the test card to avoid timeouts that could invalidate the results. If the antigen test is positive, it needs to be reported early and promptly, and appropriate isolation measures should be taken, and further examination should be carried out with proper precautions. Do not go to public places until the test results are available to avoid transmission of the virus.