How long does hepatitis B vaccine last?

Hepatitis B vaccine is a vaccine against hepatitis B virus infection. After vaccination, the body will produce hepatitis B surface antibodies, which can neutralize hepatitis B virus and prevent infection. The validity period of hepatitis B vaccine is mainly related to the following factors: 1. Vaccination dose and time: In general, the larger the vaccination dose, the longer the validity period; the earlier the vaccination time, the longer the validity period may be. 2. Individual immune response: everyone's immune response is different, some people may respond better to hepatitis B vaccine, produce higher antibody levels, and the validity period may be longer. 3. Lifestyle and health status: Some lifestyle and health conditions may also affect the validity period of hepatitis B vaccine, such as long-term drinking, suffering from other diseases, etc. It should be noted that the validity period of hepatitis B vaccine is not absolute, and antibody levels may decline over time. Therefore, after vaccination, it is necessary to conduct regular hepatitis B five tests to understand antibody levels. If the antibody level is low or disappears, it is necessary to re-inoculate hepatitis B vaccine in time. For special groups, such as hepatitis B virus carriers, immunocompromised persons, and those receiving immunosuppressant treatment, the effect of hepatitis B vaccine may not be ideal, and individualized prevention and treatment are required according to specific circumstances. In short, the validity period of hepatitis B vaccine varies from person to person, and regular inspection and re-inoculation are required. At the same time, maintaining a healthy lifestyle and good personal hygiene habits are also important measures to prevent hepatitis B infection.