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Allergy is a disorder of the immune system often also referred to as atopy. Allergic reactions occur to 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. Common allergic reactions include eczema, hives, hay fever, asthma, food allergies, and reactions to the venom of stinging insects such as wasps and bees.

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Allergic Reactions

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Allergic Reaction

The look and feel of an allergic reaction depends on the body part involved and ... WebMD Message Boards & Blogs. Health A-Z. ADD/ADHD. Allergies. Alzheimer's ...www.webmd.com/allergies/severe-allergy-symptoms

Eek! It's another blog.: Suffering an Allergic Reaction?

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Wikipedia About Allergic Reaction

Allergy is a disorder of the immune system often also referred to as atopy. Allergic reactions occur to 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. Common allergic reactions include eczema, hives, hay fever, asthma, food allergies, and reactions to the venom of stinging insects such as wasps and bees.

Mild allergies like hay fever are highly prevalent in 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 and potentially death.

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 and levels of allergen-specific IgE. Treatments for allergies include allergen avoidance, use of anti-histamines, steroids or other oral medications, immunotherapy to desensitize the response to allergen, and targeted therapy.

Classification and history

The concept of "allergy" was originally introduced in 1906 by the Viennese pediatrician Clemens von Pirquet, after he noted that some of his patients were hypersensitive to normally innocuous entities such as dust, pollen, or certain foods. Pirquet called this phenomenon "allergy" from the Greek words allos meaning "other" and ergon meaning "work". Historically, all forms of hypersensitivity were classified as allergies, and all were thought to be caused by an improper activation of the immune system. Later, it became clear that several different disease mechanisms were implicated, with the common link to a disordered activation of the immune system. In 1963, a new classification scheme was designed by Philip Gell and Robin Coombs that described four types of hypersensitivity reactions, known as Type I to Type IV hypersensitivity. With this new classification, the word "allergy" was restricted to only type I hypersensitivities (also called immediate hypersensitivity), which are characterized as rapidly developing reactions.

A major breakthrough in understanding the mechanisms of allergy was the discovery of the antibody class labeled immunoglobulin E (IgE) - Kimishige Ishizaka and co-workers were the first to isolate and describe IgE in the 1960s.

Many allergens such as dust or pollen are airborne particles. In these cases, symptoms arise in areas in contact with air, such as eyes, nose and lungs. For instance, allergic rhinitis, also known as hay fever, causes irritation of the nose, sneezing, and itching and redness of the eyes. Inhaled allergens can also lead to asthmatic symptoms, caused by narrowing of the airways (bronchoconstriction) and increased production of mucus in the lungs, shortness of breath (dyspnea), coughing and wheezing.

Search results for Allergic Reaction

Introduction: Allergic Reactions: Merck Manual Home Edition

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Allergic Reaction-Topic Overview

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Food allergy - Wikipedia, the free encyclopedia

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Cat’s cough likely asthma

Tacoma News TribuneTabitha, Brenda’s 7-year-old tabby cat, has a cough.http://www.thenewstribune.com/soundlife/story/736844.html

Push is on to put medical records online - Sun, 10 May 2009 PST

The Spokesman-ReviewThose who grew up in the pre-Internet world can remember having little access to their credit reports. Today, consumers easily can check and understand their credit scores online. Similarly, access to health records has been shrouded in mystery. But Microsoft, Google and Inland Northwest Health Services in Spokane want to change that, putting people more in control of their medical histories and ....http://www.spokesman.com/stories/2009/may/10/push-is-on-to-p...

Food Allergy Safety 101

Carteret County News-Times(ARA) - With the number of children with life-threatening food allergies on the rise, practicing food allergy safety is more important than ever.http://www.carteretnewstimes.com/articles/2009/05/10/food/76...

For kids, allergies tough to swallow

The Petersburg Progress-IndexFORT LEE — Imagine being a child in a world full of delicious looking treats, but not being able to eat some of them. For some children, that’s reality.http://www.progress-index.com/articles/2009/05/10/news/pi_pr...

Make Your Home Friendly to Those With Asthma and Allergies

Carteret County News-Times(ARA) - Asthma and allergies strike nearly one in four Americans, almost 60 million people, according to the Asthma and Allergy Foundation of America. Both conditions cause adults to miss work, children to miss school, and are a leading cause of emergency room visits and hospital stays.http://www.carteretnewstimes.com/articles/2009/05/10/ara/hom...

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Food safety minute: Avoidance is the only way to prevent food ...

Sauk Valley Daily GazetteAlthough food allergies are frequently discussed, many people still have unanswered questions, such as, what are the most common food allergies, what are the symptoms of a food allergy reaction, and what to do about a suspected allergic reaction. What ... http://www.saukvalley.com/articles/2008/10/08/features/food/...

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Russell Stover Candies Issues Recall

WAPTNo incidents of illness or allergic reaction have been reported. The recalled product was distributed in the following states and cities: Texas, California, Louisiana, North Carolina, South Carolina, Virginia, Tennessee; Southaven, Miss.; Billings ... http://www.wapt.com/health/17687518/detail.html

New study shows potential benefits of innovative Xolair® anti-IgE ...

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Pool Boy off clout-free in ComEd power probe

Chicago TribuneThey were suffering from an allergic reaction to clout, and confronted the ComEd crew that night, wondering how the guy with the juju in the neighborhood got a generator when all the ice cream in their freezers melted into sticky puddles. City ... http://www.chicagotribune.com/news/columnists/chi-kass-fri-p...

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Allergic Reaction-Topic Overview

Allergies are an overreaction of the body's natural defense system that helps fight infections (immune system). http://www.webmd.com/allergies/tc/Allergic-Reaction-Topic-Ov...

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Allergic Reaction | Allergic Reaction to Peanuts | Reactions to ...

Allergic reaction is caused by an immune system malfunction. The immune system misidentifies the allergen as dangerous and overreacts with mild or severe reactions..http://www.peanutallergy.com/allergic-reaction.html

Allergies Topic Center - DrGreene.com

Did you know that skin rashes, nausea, and diarrhea don’t necessarily mean that your child is allergic to penicillin? If you’re concerned about your child’s allergies and are ... http://www.drgreene.com/54_10.html
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Answers for Allergic Reaction

cybella27allergic reaction?cybella27Actually, it is a very common occurance to have an allergic reaction to extreme sunlight. It may be completely isolated or over the entire body. The lotion is also a good possibility. There may b...moochHow long should an allergic reaction symptom to an antibiotic last?moochI'd like to ask some additional questions, but you don't allow email. I'm going to assume that this is a self-medication and that you are aware of what cipro is good at treating and what it is not....KachinadollAnyone ever had an allergic reaction to strawberry Twizzlers?KachinadollNope i havent but there is something that is strawberry like in twizzlers of course. Oh and thanks for the answer on my question. If you can, Can you please tell me about being a wiccan and why you...chiefsfan0001what can I do about an allergic reaction to halloween makeup?chiefsfan0001I think It would be a good idea to call her doctor and tell him/her, it would be nice to get their opion on the matter. Do you still have the box for the holloween makeup, you might want to check what...PeytonHow common is it to have an allergic reaction to eye makeup?Peytonit is more common than you think. after years in cosmetics, i have met many women who have allergic reactions to shadows and other eye makeup. it is true that the cheaper brands tend to be more irrita...
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