Allergen
type of antigen that produces an abnormally vigorous immune response, in which the immune system reacts to fight off a perceived threat that would otherwise be harmless to the body From Wikipedia, the free encyclopedia
An allergen is something that causes allergies in humans.
Dust, pollen and pet dander are all common allergens. It is possible to be allergic to anything from chlorine to perfume. Food allergies are not as common, but some foods, like peanuts, nuts, seafood and shellfish cause serious allergies in lots of people.
Some common allergens could be:
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