A hepatitis B booster shot is about$100, depending on whether the hepatitis B vaccine chosen is domestic or imported. Patients can voluntarily decide which drug to choose, and can go to their local community health center or CDC for consultation. However, a hepatitis B test needs to be done before the hepatitis B booster injection, and only if the surface antibody titer is less than the protective value of 10 IU/mL will the vaccine need to be replenished in a timely manner. This will enable the body to maintain an effective surface antibody titer and effectively prevent hepatitis B virus infection. If the titer is higher than the protective value, the hepatitis B vaccination can be temporarily dispensed with. If the surface antibody is negative, you need to re-inject three doses of hepatitis B vaccine, in the order of 0-1-6, and then test whether antibodies are produced one month after the injection is completed.