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Are there different categories of allergies?

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Allergens, or allergy-causing substances, can be airborne substances (e.g., pollens, dust, smoke), infectious agents (bacteria, fungi, parasites), foods (strawberries, chocolate, eggs), contactants (poison ivy, chemicals, dyes), or physical agents (light, heat, cold).

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Get more facts and information about allergy . Or, view the full encyclopedia entry from The Columbia Encyclopedia, Sixth Edition.

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