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Internal Medicine Board Review / USMLE Exam Review: Medical Mnemonic for types of Hypersensitivity Reactions - "ACID"

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  1. 1. Hypersensitivity Reactions - Types Mnemonic: “ACID” Hypersensitivity Reaction Description Type I Bee stings IgE-mediated; quick onset after exposure Latex Certain medications (e.g. Penicillin) Allergic Intellectual Property of Type II Cytotoxic/antibody-mediated Cytotoxic Hemolytic reactions Goodpasture syndrome Hyperacute graft rejection Type III Hypersensitivity pneumonitis Systemic lupus erythematosus Polyarteritis nodosa Serum sickness Immune complex/IgG/IgM mediated Immune complex deposition Type IV Delayed or cell-mediated Delayed Chronic graft rejections PPD test Latex Nickel Poison ivy