After a hepatitis B vaccination, the hepatitis B surface antibodies can be maintained for at least 3-5 years, and in some cases, more than 10 years, so after the hepatitis B vaccination, the hepatitis B test can be repeated in 3-5 years. If you still have hepatitis B surface antibodies after the recheck, you can skip the hepatitis B vaccination. If the surface antibodies are weakened, a booster shot can be given. Some people who do not develop surface antibodies after the hepatitis B vaccine can be re-injected according to the 0-1-6 protocol, or a one-time dose of 60 ug for three injections, and if they fail to develop antibodies after two repeated injections, they do not need the hepatitis B vaccine. Whether or not hepatitis B surface antibodies are produced depends on the individual’s constitution and is influenced by genetic factors.