Antigen testing generally refers to neocoronavirus antigen testing, which does not exclude the possibility of error, but the likelihood of error is relatively small. The antigen test is designed to detect neocoronavirus proteins in nasal swabs. If the sample contains a high level of neocoronavirus, it will react with antibodies to the neocoronavirus proteins in the test card, and the antigen and antibody will combine to produce a positive band. If the virus content in the sample is low, the presence of very small amounts of protein may not be detected. Since the antigen-antibody reaction has a certain minimum detection limit, false negatives may occur in people with low levels of virus in the organism. In addition, if the body is accompanied by other microbial infections, taking certain medications, eating certain foods, etc., there will be interfering substances in the test specimen, which may induce the test results to show false-positive results, as some people may use reagents from different manufacturers, ordinary swabs instead of matching swabs, false-positive results may also occur. Therefore, antigen testing should be performed in strict accordance with the instructions, and if the results are abnormal, prompt medical diagnosis and treatment interventions should be taken.