Antibodies circulate through the bloodstream in order to fight off these substances. In allergy sufferers, however, the immune system overreacts, releasing antibodies to attack ...
http://www.brainpopjr.com/health/bewell/allergies/

Allergy is a disorder of the immune system often also referred to as atopy. Allergic reactions occur to environmental substances known as allergens; these reactions are acquired ...
http://en.wikipedia.org/wiki/Allergy

The term allergy is used to describe a response, within the body, to a substance, which is not necessarily harmful in itself, but results in an immune response and a reaction that ...
http://www.allergyuk.org/allergy_whatis.aspx

It is misguided because these foreign substances are usually harmless and remain so to nonallergic people. Allergy-producing substances are called "allergens." Read More About ...
http://www.medicinenet.com/allergies/focus.htm

... seldom cause a fever and are not related to hay. Perennial rhinitis describes year-round nasal allergies, which are caused by substances ...
http://www.coolnurse.com/allergies.htm

An allergy is an abnormal reaction by a person's immune system against a normally harmless substance. A person without allergies would have no reaction to this substance, but when a ...
http://allergies.about.com/od/allergies101/a/whatisanallergu.htm

Definition Return to top. An allergy is an exaggerated immune response or reaction to substances that are generally not harmful. See also: Allergic reactions; Allergy testing ...
http://www.nlm.nih.gov/medlineplus/ency/article/000812.htm

People who suffer from aloe allergies can have a painful or uncomfortable reaction to contact with aloe, but these allergies can be identified and avoided.
http://allergyallergies.com/aloe-allergies-come-from-plant-substances/

An allergy is a reaction to a foreign substance by a person sensitive to that substance. Allergies are part of the body's immune mechanisms. They are triggered when an antigen--a ...
http://www.bookrags.com/Allergy

The term allergy applies to an abnormal reaction by your immune system to a substance that is usually not harmful. Learn more.
http://www.webmd.com/allergies/understanding-allergies-basics

Allergy-producing substances are called "allergens." Examples of allergens include pollens, dust mite, molds, danders, and foods. To understand the language of allergy it is ...
http://www.medicinenet.com/allergy/article.htm

An allergy is a reaction to a foreign substance by a person sensitive to that substance. Allergies are part of the body's immune mechanisms. They are triggered when an antigen--a ...
http://www.bookrags.com/research/allergy-wsd/

The effectiveness of immunotherapy varies depending on the severity of a person's allergies and the number of substances to which the person is allergic.
http://www.webmd.com/allergies/guide/shots

Allergies are diseases of the immune system that cause an overreaction to substances called "allergens." Allergies are grouped by the kind of trigger, time of year or where ...
http://www.aafa.org/display.cfm?id=9&cont=78

The scratch test (one of the most common methods) involves placement of a small amount of suspected allergy-causing substances (allergens) on the skin (usually the forearm, upper ...
http://www.healthcentral.com/allergy/index-003519-108.html

Allergens are everywhere -- in the air we breathe, in the food we eat, in the medicine and cosmetics we use, and in plants in our backyard. Here are the most common ones.
http://www.dhmc.org/webpage.cfm?site_id=2&org_id=510&gsec_id=0&sec_id=0&item_id=25071&utility_id=48&fuseaction=cg&id=000050

An Effective Treatment for Allergies & Food and Substance Sensitivities. Do you suffer from... Allergies to molds, pets, pollen, dust mites, and so on? Food allergies or sensitivities? ...
http://www.eft-alive.com/allergy-antidotes.html

The substances that trigger allergy are called allergen. Examples include pollens, dust mite, molds, danders, and certain foods. People prone to allergies are said to be allergic ...
http://www.medterms.com/script/main/art.asp?articlekey=2201

An allergy is an exaggerated immune response or reaction to substances that are generally not harmful.See also:Allergic reactionsAllergy testingAllergy to mold, dander, dustDrug ...
http://pennhealth.com/ency/article/000812.htm

Allergy is a medical term generally used to describe the symptoms that result from the body s reaction to some foreign substance, called an allergen.
http://health.rutgers.edu/brochures/allergies.htm