Hepatitis B vaccination is to prevent infection by the hepatitis B virus. You cannot receive the hepatitis B vaccine in one of the following cases: i. If you have a febrile disease, you cannot receive the hepatitis B vaccine. This is because immune-responsive fever occurs in individuals after receiving the hepatitis B vaccine and is easily confused by the cover-up and cannot be disposed of in a timely manner. Second, people with a history of allergy to hepatitis B vaccine should not receive hepatitis B vaccine, otherwise there will be obvious local or systemic allergic reactions. Third, people with abnormal liver function cannot be vaccinated with hepatitis B vaccine, otherwise they will be further affected by changes in liver function. Fourth, people with positive hepatitis B surface antibody cannot be vaccinated with hepatitis B vaccine. Because the purpose of hepatitis B vaccination is to stimulate the body to produce hepatitis B surface antibodies. Since there are enough surface antibodies in the body, there is no need to receive hepatitis B vaccine. V. People infected with hepatitis B virus cannot receive hepatitis B vaccine regardless of acute or chronic infection.