If the antigen test appears to be red throughout the swab, this indicates that the test was incorrect and needs to be retested. Antigen test paper test is generally two bars, generally is divided into T area and C area of two bars, if both bars are red, it means it is positive, if it is only pure T area red means it is negative, if it is C area positive or the whole swab appeared to be red, then it is to consider that the test is wrong. If you use antigen testing yourself. The use of non-standardized will appear some detection error, it is recommended that you can go to the hospital or follow the instructions for testing. At present, during the new crown epidemic, the new crown antigen test is more convenient, but the confirmation of the diagnosis needs to be based on the nucleic acid of the new crown virus, so if the new crown antigen test appears to be positive or weakly positive, it is necessary to report to the community as soon as possible, and go to the hospital for isolation and treatment.