what is an allergen
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Allergen An allergen is a type of antigen that produces an abnormally vigorous immune response in which the immune system fights off a perceived threat that would otherwise be harmless to the body. Such reactions are called allergies.
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Allergic Reactions to Hair Color What is an Allergy? 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 person who is allergic encounters the trigger, the body reacts by releasing chemicals which cause allergy symptoms.
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Allergic Reaction An allergic reaction occurs when the immune system overreacts to a harmless substance known as an allergen. The immune system protects the body from infections, viruses and diseases.
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Allergy Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes little or no problem in most people. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, runny nose, shortness of breath, or swelling. Food intolerances and food poisoning are separate conditions.
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Allergies What Are the Symptoms of an Allergy? An allergy occurs when the body’s immune system sees a substance as harmful and overreacts to it. The symptoms that result are an allergic reaction. The substances that cause allergic reactions are allergens. Allergens can get into your body many ways to cause an allergic reaction. You can inhale allergens into your nose and your lungs. Many are small enough to float through the air. Examples are pollen, house dust, mold spores, cat and dog dander and latex dust. You can ingest allergens by mouth.
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Drug allergies Drug allergies are a group of symptoms caused by an allergic reaction to a drug (medicine). A drug allergy involves an immune response in the body that produces an allergic reaction to a medicine. The first time you take the medicine, you may have no problems.
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- allergen-any substance that can cause an allergy. substance-a particular kind or species of matter with uniform properties; shigella is one of the most toxic substances known to man. ragweed pollen-pollen of the ragweed plant is a common allergen. Translations.
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Everything you need to know about allergies Allergies are hypersensitive immune responses to substances that either enter or come in contact with the body, such as pet dander, pollen or bee venom. A substance that causes an allergic reaction is called an allergen.
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allergen allergen. 1. a substance, protein or nonprotein, capable of inducing allergy or specific hypersensitivity. 2. a purified protein of a food (such as milk, eggs, or wheat), bacterium, or pollen. adj., adj allergen´ic. Allergens are used to test a patient for hypersensitivity to specific substances (see skin test).
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Breathe easy: Taking control of asthma Allergen: A substance that can cause an allergic reaction. Common allergens include ragweed pollen, animal dander, and mold.
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- Allergies are an abnormal response of the immune system. People who have allergies have an immune system that reacts to a usually harmless substance in the environment. This substance (pollen, mold, and animal dander, for example) is called an allergen.
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Food intolerance Food intolerance. Food intolerance is a detrimental reaction, often delayed, to a food, beverage, food additive, or compound found in foods that produces symptoms in one or more body organs and systems, but generally refers to reactions other than food allergy. Food hypersensitivity is used to refer broadly to both food intolerances and food allergies. Food allergies are immune reactions, typically an IgE reaction caused by the release of histamine but also encompassing non-IgE immune responses. This mechanism ca
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Latex Allergy In any type of allergy, when the immune system reacts against an otherwise harmless substance, the substance is called an allergen. When the immune system detects the allergen, a type of antibody named immunoglobulin E (IgE) is produced, triggering the release of chemicals within the body. One chemical is histamine.
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Meet The Challenge.... Become An Expert In Your Field The Warrant Officer Recruiting Team is charged with recruiting highly qualified applicants to serve as Army Warrant Officers. Warrant Officers are highly specialized experts and trainers in their career fields.
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- Defining food allergies. An allergy is basically an overreaction by your immune system to a protein that it perceives as a threat — for example, the proteins in particular types of food, the dust mite protein, or pollen.
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- Dental Terms. When an allergen enters the body, it causes the body's immune system to develop an allergic reaction in a person with an allergy to it. This reaction can occur when the immune system attacks a normally harmless substance (the allergen).
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Allergic Rhinitis An allergen is a typically harmless substance that causes an allergic reaction. Allergic rhinitis, commonly known as hay fever, is an allergic response to specific allergens. Some typical allergens are grass, dust, and mold. Pollen is the most common allergen.Your body releases histamine when it encounters an allergen. A histamine is a natural chemical that defends your body from the allergen. This chemical causes allergic rhinitis, which can have many uncomfortable symptoms such as a runny nose, sneezing, and itchy eyes.Seek treatment if you have this condition. It can interfere with your quality of life.llergic rhinitis, commonly known as hay fever, is an allergic response to specific allergens. Some typical allergens are grass, dust, and mold. Pollen is the most common allergen.
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alloantigen Definition of alloantigen. : an antigen present only in some individuals (as of a particular blood group) of a species and capable of inducing the production of an alloantibody by individuals which lack it.
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Food Allergies Causes and symptoms. Food allergies are caused by the immune system's reaction to a food item that it believes is harmful. When the food is digested, the immune system responds by creating immunoglobulin E (IgE) antibodies as a defense. The antibodies are proteins found in the bloodstream.
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Homeopathy: Allergies â The Soulâs Cry for Help? Allergies are abnormal immune system reactions to things that are typically harmless to most people. When you're allergic to something, your immune system mistakenly believes that this substance is harmful to your body. In an attempt to protect the body, the immune system produces IgE antibodies to that allergen.
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Drug allergies URL of this page: //medlineplus.gov/ency/article/000819.htm. Drug allergies are a group of symptoms caused by an allergic reaction to a drug (medicine). A drug allergy involves an immune response in the body that produces an allergic reaction to a medicine. The first time you take the medicine, you may have no problems.
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Allergy (Allergies) 1 Allergy involves an exaggerated response of the immune system, often to common substances such as foods or pollen. 2  The immune system is a complex system that normally defends the body against foreign invaders, such as bacteria and viruses, while also surveying for conditions such as cancer and autoimmunity.
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allergy Full Definition of ALLERGY. 1. 2. : exaggerated or pathological immunological reaction (as by sneezing, difficult breathing, itching, or skin rashes) to substances, situations, or physical states that are without comparable effect on the average individual. 3. : medical practice concerned with allergies. 4.
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Allergy Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to something in the environment that usually causes little problem in most people.llergies are common. In the developed world, about 20% of people are affected by allergic rhinitis, about 6% of people have at least one food allergy, and about 20% have atopic dermatitis at some point in time.
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Eye Allergies Allergy symptoms occur when your immune system overreacts to something that is harmless to most people but triggers a reaction in anyone sensitive to it. This substance is known as an allergen. Allergies can be seasonal (worsening during certain times of the year, such as pollen allergies in the spring) or perennial (occurring year-round).
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- The substances that cause allergic disease in people are known as allergens. “Antigens,” or protein particles like pollen, food or dander enter our bodies through a variety of ways. If the antigen causes an allergic reaction, that particle is considered an “allergen” – and antigen that triggers an allergic reaction.