Two bars of antigen means it is positive, indicating infection with a certain pathogen, and you should go to the hospital as soon as possible. Currently, the most common antigen test is the antigen test for the new coronavirus. If the test is positive for the antigen with two bars, it means that the new coronavirus is infected, and the patient needs to be reported to the community first, and then go to the centralized quarantine place for quarantine treatment. If the antigen test is positive for HIV, it means that the patient may be infected with HIV, and it is recommended that the patient should go to the AIDS department and be treated regularly with antiviral drugs such as efavirenz, lamivudine and tenofovir. If the hepatitis B surface antigen is positive, then hepatitis B virus infection should be considered, and it is recommended to go to the hospital for a comprehensive assessment of the need for antiviral treatment.