Hypersensitivity reactions Four Types of Hypersensitivity: 1.Type I Hypersensitivity: Immediate; in allergy, atopy, and anaphylaxis 2.Type II Hypersensitivity: Ab-dependent Cytotoxicity 3.Type III Hypersensitivity: Immune Complex Disease 4.Type IV Hypersensitivity: delayed type/cell-mediated immune responses Type I Hypersensitivity Type II Hypersensitivity Type III Hypersensitivity Type IV Hypersensitivity Local Systemic Phagocytic Inflammatory Antibody Mediated Cellular Dysfunction (Previously Known