In the absence of antibodies, most people get themselves antibodies by vaccination. The antibodies referred to here are protective antibodies, with which you are protected from pathogenic microorganisms, such as surface antibodies to hepatitis B. If you want to get surface antibodies to hepatitis B, you can get the hepatitis B vaccine. If, after exposure, such as the corresponding exposure to hepatitis B, there are no corresponding antibodies, then, in addition to the hepatitis B vaccine, one should directly inject human hepatitis B immunoglobulin, which is the corresponding antibody, to immediately obtain the corresponding immunity and achieve blocking measures. This is a method of obtaining antibodies, which are injected directly into the body with the corresponding antibodies. In rabies prevention, after exposure, many cases require rabies vaccination. In some cases, the rabies vaccine alone does not immediately allow the body to acquire antibodies, and sometimes it is necessary to inject rabies human immunoglobulin, or anti-rabies serum, which is also a direct injection of antibodies.