Weakly positive hepatitis B surface surface antibody suggests that there is hepatitis B surface antibody in the body, but the defense ability of the antibody is weak, so it does not have the ability to maintain resistance against the virus. How long the weak positive hepatitis B surface antibody can be maintained depends on the specific situation. Hepatitis B surface antibody is a specific protective antibody produced by the body stimulated by hepatitis B surface antigen. After 1-2 injections of Hepatitis B vaccine, most people will produce more than 10IU/L of Hepatitis B surface antibody, which can prevent infection of Hepatitis B virus after exposure. The length of time the antibodies are present varies from person to person, with some being present for 3-5 years and others for 7-8 years or longer. With the passage of time, the antibody will decay. About ten years after the injection of hepatitis B vaccine, the antibody titer will decrease and there will be weakly positive hepatitis B surface antibody, which indicates that the body’s ability to fight against the virus has decreased and cannot meet the need to protect the body. Therefore, it is recommended that patients go to the community or health epidemic prevention station for hepatitis B vaccination in time to ensure that the antibody titer is above 10IU/L to resist viral infection.