The so-called infected hepatitis B virus should be divided into two cases: one is that after infection with the virus, the virus is quickly cleared by the body, such people have the corresponding antibodies to the surface antigen of the hepatitis B virus, and many people may also have antibodies to the E antigen or core antibodies, they are safe and do not need to be vaccinated at all. Another situation is that after being infected with the hepatitis B virus, the body has not been able to effectively clear the virus. This situation is divided into two states: one is positive for hepatitis B surface antigen and positive for viral gene, in fact they are hepatitis B virus infected people, or hepatitis B patients; one is positive for hepatitis B surface antigen, but negative for viral gene or can not be measured, these people should be “small three positive”. In either case (i.e. positive or negative), it is important to know that since the surface antigen of the hepatitis B virus is positive, vaccination against hepatitis B is pointless and even ridiculous. Why? Because the hepatitis B vaccine itself is the surface antigen of the hepatitis B virus. Imagine that the surface antigen-positive person already has a large amount of “vaccine” in his body, and these long-standing “vaccine” components in the body simply do not make the body produce antibodies, so what is the point of in vitro vaccination? Unfortunately, there are still a few doctors in a few regions who give hepatitis B vaccine to surface antigen-positive patients against the requirements of the guidelines. We hope that the above explanation will correct the error in understanding.