Hepatitis B vaccine booster shot, how often to hit

Hepatitis B vaccine to strengthen the needle how long to hit a needle can not be generalized, and the specific circumstances of individuals, some people can be injected with hepatitis B vaccine after lifelong immunity, some people will gradually disappear after the injection effect, can be injected with hepatitis B vaccine to strengthen the needle after one to two years check hepatitis B surface antibody. If the result is weak positive, you can inject a strengthening needle.