About High School Biology - Immunoregulation in About Immunology Applications

Immune recognition is achieved by macrophages and lymphocytes, recognizing antigenic determinants

The body's own cells also carry antigenic determinants; however, the body's immune cells kill those that recognize their own antigenic determinants as they develop, thus avoiding autoimmunity

Strictly speaking, before injecting a serum, it is necessary to test for allergies to ensure that there will be no immune response.

Because poisoning starts with binding off the toxin, antisera, which are specific antibodies produced by other animals against the toxin protein, bind quickly.

If a human wants to be immunized against what is contained in the serum, a relatively long immune process needs to be activated to produce the appropriate antibodies.

So, with injected immune serum, passive immunization takes effect before active immunization. In other words, before a person is immune to the antibodies in the serum, these antibodies are already functioning, forming antigen-antibody complexes that are cleared by the body, too late to elicit the body's immune response to them