They can be composed of cells, virus and biological or synthetic fluids, which invade our body. At that moment, the body recognizes the antigens as a foreign body and releases antibodies to fight them.
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Each antigen has a specific antibody that is capable of destroying it, this specificity is called a key-key relationship.
To the vaccines they are produced using attenuated antigens of the disease that one wants to fight, as they are expected to activate the immune system without making the person sick.
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