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Ever wondered what Hypersensitivity Disorders are? This chapter delves into the causes, mechanisms, and classification of these conditions.We explore how antibodies, especially IgE, play a crucial role in allergic reactions, with examples like peanut allergies.Here, we detail the mechanisms of immune complex-mediated diseases, focusing on how antibodies and antigens form complexes that can cause tissue damage.Our illustration demonstrates how antibody-mediated responses can lead to inflammation and tissue injury, including conditions like autoimmune hemolytic anemia.Discover various diseases caused by cell- or tissue-specific antibodies, ranging from autoimmune hemolytic anemia to Myasthenia Gravis.We also examine immune complex-mediated glomerulonephritis, showing how these complexes can impact kidney function.This diagram illustrates the sequence of immunologic responses, from antigen exposure to immune complex formation and subsequent tissue injury.Learn about diseases caused by lymphocytes, particularly T-cell-mediated cytotoxicity, which can lead to various tissue damages.This figure visually explains cytokine-mediated inflammation, showing the roles of CD8+ T cells and other immune cells in tissue injury.We categorize T-cell-mediated diseases, including diabetes and inflammatory bowel disease, highlighting the specific cytokines involved.