IMMUNOLOGY

Detailed explanation-1: -A complete antigen is one that both induces an immune response and reacts with the products of it, whereas an incomplete antigen or hapten is unable to induce an immune response alone but is able to react with the products of it, e.g., antibodies.

Detailed explanation-2: -“Antigens” are molecular structures on the surface of viruses that are recognized by the immune system and are capable of triggering one kind of immune response known as antibody production.

Detailed explanation-3: -Antigens are known to trigger the immune system. They can be endogenous, exogenous, or autoantigens. Examples of antigens are pollen, bacteria, parasitic worms, and viruses.