A vertical line at C indicates a negative test result and a vertical line at T indicates an invalid test result. It is recommended that a specimen be retained for the Neocoronavirus Antigen test under the supervision of a doctor. A vertical line at C indicates that the test result is valid, negative, and that there is no neocoronavirus infection. A vertical line at T indicates that the test is invalid, which may be due to irregular collection, insufficient specimen volume, or failure of the kit, etc., and requires re-testing. The presence of a vertical line at both C and T on the viral antigen test kit indicates that the test is positive for New Crown, i.e., you are infected with New Crown virus and need to go to a specialized hospital for treatment.