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What are antigens and antibodies?

Update Time:2023/4/13

What Are Antigens And Antibodies?
Antigens and antibodies are relative concepts. Antigens and antibodies are essential components of the body's immune system, and antibodies are produced by the autoimmune system and are produced by B cells after they have differentiated into plasma cells, and a type of plasma cell generally produces only one type of antibody. Antigens include both self and foreign substances. In clinical practice, especially in infection units, the more frequently mentioned antigens are components of microorganisms, including viruses, bacteria, fungi, rickettsia, chlamydia, mycoplasma, and parasites, etc. Some components of these foreign microorganisms and parasites that can induce the body's immune system to produce antibodies are called antigens. Antigens are substances that are targeted by antibodies. When a pathogenic microorganism infects a person, it may produce one or more antigens, which are recognised by the body's immune system and produce antibodies that are used to bind these antigens and produce agglutination and some other reactions. The substances that can target and bind to antigens are antibodies, which come from different sources. There are also antigens from the body itself that the autoimmune system mistakes for an external source and therefore produces antibodies.