Antigen testing and nucleic acid testing are all part of a method of testing for infection with the new coronavirus. Antigen-positive nucleic acid tests are negative and continue to be tested.
Because of the relatively high sensitivity of nucleic acid testing, nucleic acid testing is still needed after a positive antigen test result to prevent false-positive antigen test results. However, a negative nucleic acid test does not confirm that the patient is not infected with the new coronavirus, and follow-up nucleic acid testing is still required.
Under normal circumstances, if the nucleic acid test is negative on all three occasions, the chance of being infected with NeoCoronavirus will be greatly reduced, but the possibility of being infected with NeoCoronavirus still cannot be ruled out. If the nucleic acid test is positive, the patient will be diagnosed as infected with Neocoronavirus and will need to be quarantined in a hospital for treatment.
Patients with a positive antigen test are also considered to be infected with Neocoronavirus, so it is recommended that the patient be isolated in the hospital for treatment and that nucleic acid tests be performed periodically to determine whether or not the patient is infected.