| Hypersensitivity refers to undesirable (damaging, | | | | intended ligand binding with the receptor or mimics the |
| discomfort-producing and sometimes fatal) reactions | | | | effects of the ligand, thus impairing cell signaling and the |
| produced by the normal immune system. | | | | delayed hypersensitivity (DH), delayed-type |
| Hypersensitivity is a state of altered reactivity in which | | | | hypersensitivity (DTH) that which takes 24 to 72 hours |
| the body reacts with an exaggerated immune | | | | to develop and is mediated by T lymphocytes rather |
| response to a foreign agent; allergy is a synonym for | | | | than by antibodies; usually used to denote the subset |
| hypersensitivity. anaphylaxis is a form of | | | | of type IV hypersensitivity involving cytokine release |
| hypersensitivity. Hypersensitivity reactions require a | | | | and macrophage activation, as opposed to direct |
| pre-sensitized (immune) state of the host. The causes | | | | cytolysis, but sometimes used more broadly, even as |
| of the hypersensitive are protein component, water | | | | a synonym of type IV h. |
| which contains the chemicals and bacteria, unaware | | | | Only someone as refined and delicate as a princess |
| exposure to avery toxic chemical. | | | | would be able to feel a single pea through 23 |
| The Gell and Coombs classification (below) | | | | mattresses. This strange statement is evolved from |
| distinguishes four types of hypersensitivity reactions | | | | the fairy that the measurement of a true princess was |
| based on antibody (I-III) or cell-mediated (IV) reactions | | | | one who was sensitive enough to feel a pea under a |
| and constitutes a logical framework for understanding | | | | tall stack of mattresses. |
| hypersensitivity reactions although. Hypersensitivity to | | | | The immune system is an integral part of human |
| flying insects such as flies and mosquitos is the most | | | | protection against disease, but the normally protective |
| common cause of itching in horses. Itching is caused | | | | immune mechanisms can sometimes cause |
| by the bite itself because flies have chewing | | | | detrimental reactions in the host. Such reactions are |
| mouthparts and the bite is painful for the horse. | | | | known as hypersensitivity reactions, and the study of |
| However, it’s not only the bite as many horses | | | | these is termed immunopathology. Hypersensitivity is a |
| are hypersensitive to the saliva of the insect and this | | | | state of altered reactivity in which the body reacts |
| increases the inflammation. | | | | with an exaggerated immune response to a foreign |
| There are several types hypersensitivity and they are | | | | substance. Hypersensitivity reactions are classified as |
| antibody-dependent, immune complex, cell-mediated, | | | | immediate or delayed, types I and IV, respectively, in |
| the immediate in which this have guinea pig is injected | | | | the Gell and Coombs classification of immune |
| intravenously with an antigen. For this example, bovine | | | | responses. |
| serum albumin (BSA, a protein) will be used. After two | | | | Hypersensitivity can also be a symptom of ADD and |
| weeks, the same antigen will be reinjected into the | | | | ADHD (Symptoms of Adult ADD) and may also be |
| same animal. | | | | associated with certain mood disorders such as |
| Within a few minutes, the animal begins to suffocate | | | | schizophrenia, OCD, anxiety disorders, bipolar disorder |
| and dies by a process called anaphylactic shock, | | | | and as part of the cycle whenever someone |
| stimulatory which have binding to cell surface | | | | experiences panic attacks. If you are experiencing |
| components, the antibodies recognize and bind to the | | | | hypersensitivity to the extent that is a health threat, |
| cell surface receptors, which either prevents the | | | | see the appropriate mental health professional. |