From the point of view of immunology, as long as there are surface antibodies after hepatitis B vaccination, and the titer is greater than 10mIU/ ml, there is no need to check and vaccinate hepatitis B vaccine for at least 12 years.
When surface antibodies have been produced in the body, there is no need to vaccinate against hepatitis B. Surface antibody should be said to be the most important index to evaluate the immune effect of hepatitis B vaccine, but it is not the only one. Because after hepatitis B vaccination, we not only produce antibodies, but also immune memory and cellular immune function, immune memory and cellular immunity, which are generally not evaluated. Therefore, even if the surface antibody disappears after vaccination, cellular immunity and immune memory still exist. This immune memory has existed for at least 10 years, and the longest record at present is 20 years, so there is no need to check and vaccinate hepatitis B vaccine every year.