The five tests for hepatitis B, negative for hepatitis B virus, are not infectious, indicating that there is no hepatitis B virus in the body. If the test is also negative for hepatitis B surface antibody, it also means that there is no protective antibody in the body, which is the only protective antibody in the body, and once exposed to the hepatitis B virus, it may be infectious. Therefore, it is recommended to get the hepatitis B vaccine, which is an effective way to prevent hepatitis B. The vaccination program of 0, 1 and 6 months is now commonly used, with a total of three injections. After the vaccination, protective antibodies will be produced, but these antibodies are not permanent and some people will have a gradual decrease in hepatitis B surface antibody titers over time. Therefore, it is important to have regular laboratory tests to check the status of antibody titers.