Wikipedia has the following to say about Allergies:
200-120 0cm 0cm 0pt" class="MsoNormal">Allergy is a70-411 hypersensitivity disorder of70-486MB5-705 the immune system.MB2-70370-41270-412 Allergic reactions occur to MB5-705 normally harmless environmental substances known as allergens; these reactions are acquired, predictable, and rapid. Strictly, allergy is one of four forms of hypersensitivity and is called type I (or immediate) hypersensitivity. It is characterized by excessive activation of certain white blood cells called mast cells and basophils by a type of antibody known as IgE, resulting in an extreme inflammatory response. 70-483 Common allergic reactions include eczema, hives, hay fever, asthma attacks, food allergies, and reactions to the venom of stinging insects such as wasps and bees.
Mild allergies like hay fever are highly prevalent in70-483 the human population and cause symptoms such as allergic conjunctivitis, itchiness, and runny nose. Allergies can play a major role in conditions such as asthma. In some people, severe allergies to environmental or dietary allergens or to medication may result in life-threatening anaphylactic reactions.
C_TAW12_731 class="MsoNormal">A variety of tests now exist to diagnose allergic conditions; these include testing the skin for responses to known allergens or analyzing the blood for the presence 70-483 and levels of allergen-specific IgE. Treatments for allergies include allergen avoidance, use of anti-histamines, steroids or MB5-705 other oral medications, immunotherapy to desensitize the response to allergen, and targeted therapy.
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