Hepatitis B surface antibody of 50IU/L does not require booster vaccination if you are not in the high-risk group, but if you are in the high-risk group, you need to be vaccinated in time.
If the hepatitis B surface antibody is 50IU/L, then it belongs to the range of weak positive. Usually, hepatitis B surface antibody of 100IU/L is considered strong positive, and then there is no need to be vaccinated. However, if you do not belong to the high-risk group of hepatitis B virus infection, you can have regular review to observe the changes of hepatitis B surface antibody, and if there is attenuation, you can receive booster vaccination under the instruction of doctor.
However, if the hepatitis B surface antibody is 50IU/L and you belong to the high-risk group of hepatitis B virus infection, such as medical personnel, you need to have booster vaccination in time. The probability of exposure to the hepatitis B virus is higher and more comprehensive protection is needed.
Therefore, if the hepatitis B surface antibody is 50 IU/L and you do not belong to the high-risk group, you do not need a booster shot.