People with hepatitis B cannot get the hepatitis B vaccine, which prevents infection with the hepatitis B virus, and people with hepatitis B are already infected with the virus. Hepatitis B vaccine, or hepatitis B vaccine, prevents hepatitis B virus infection. After vaccination, it stimulates the body’s immune system to produce protective antibodies. These antibodies are present in the body and when the hepatitis B virus invades the body, the immune system quickly recognizes and removes the virus, preventing infection. Hepatitis B patients include acute viral hepatitis B, chronic viral hepatitis B, and hepatitis B virus carriers. These patients have already developed hepatitis B virus infection, and another injection of hepatitis B vaccine can no longer achieve the purpose of prevention, and may also have adverse reactions such as fever and nausea. Hepatitis B vaccine is prohibited for those who suffer from hepatitis, fever, acute or chronic serious diseases, and allergies, and it is recommended to be reasonably vaccinated under the guidance of professional doctors.