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Kay Classification
| Type 1 | Immediate-type (IgE dependent) or anaphylactic hypersensitivity |
| Type 2a | Cytolytic or cytotoxic reactions |
| Type 2b | B cell-stimulating reactions involving altered cell function |
| Type 3 | Arthus type, immune complex |
| Type 4 (Th1) | Classic delayed hypersensitivity |
| Type 4 (Th2) | Cell-mediated eosinophilic hypersensitivity, and chronic allergic inflammation |
| Type 4 cytotoxic | Tissue injury by cytotoxic T lymphocytes |
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