Definition: Undimidiated is a term used in the field of immunology, specifically in the study of immune responses. It refers to a type of antigen that has been modified or changed so that it does not elicit an immediate immune response but instead stimulates the body's natural defenses against the same antigen. This modification can be achieved through various means, such as using antibiotics or other drugs, altering the structure of proteins or carbohydrates, or modifying the genetic material of the immune system itself. Undimidiated antig