Allergen

Definition

An allergen is a substance that can cause an allergic reaction. Allergens are substances that, in some people, the immune system recognizes as "foreign" or "dangerous" but cause no response for most people.

Information

Common allergens include:

• chemicals and plants
• drugs (such as antibiotics, serums)
• foods (such as milk, chocolate, strawberries, wheat)
• infectious bacteria, viruses, and animal parasites
• inhalants (such as dust, pollen, perfumes, smoke)
• physical agents (such as heat, light, friction, radiation)

See also:

• allergies
• allergic reaction
• food allergy
• allergy to drugs
• antigen
• antibody

Illustrations

Positive reaction to allergen

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