Nucleic acid testing is negative for two bars of antigen testing, and false positive results are suspected with antigen testing; nucleic acid retesting is recommended for confirmation. Antigen test and nucleic acid test are two experimental methods used to verify whether the organism carries the new coronavirus. Typically, nucleic acid testing is more accurate than antigen testing, and the sensitivity and specificity of nucleic acid testing is higher than antigen testing. When the antigen test is positive with two bars, but the nucleic acid test is negative, it is highly suspicious that the specificity of the antigen test has been affected by environmental factors, resulting in a false-positive result. In such cases, it is recommended that a more accurate method (nucleic acid test) be used for retesting to confirm the presence or absence of infection in the body. Consult a medical professional for advice.