Affinity of antibodies is a measure of the binding strength of the antibody's binding site and an epitope. Avidity of antibodies refers to the strength of the of the antibody and antigen complex itself.

Avidity vs. Affinity of Antibodies

An **epitope** is the exposed region on the surface of antigens that antibodies and T cells interact with. A single antigen may possess several epitopes, and different antibodies may bind to different epitopes on the same antigen.

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An antigen is a molecular structure on the surface of a pathogen that the immune system recognizes as foreign or potentially harmful. They stimulate the production of antibodies or activate other immune cells to attack and neutralize it.

Antigens

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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Epitopes

Superantigens are exotoxins that trigger a nonspecific stimulation of immune cells to secrete cytokines. The overproduction of cytokines, known as a cytokine storm, triggers a strong immune and inflammatory response that can lead to life-threatening conditions such as high fevers, low blood pressure, multi-organ failure, shock, and death.

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