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Lymphatic System

Allergies

How do immediate allergic reactions differ from delayed allergic reactions?

Immediate allergic or hypersensitive reactions are mediated by mast cells. The reactions occur within minutes following contact with an allergen. Inhaled or ingested allergens usually cause immediate allergic reactions.

Delayed allergic or hypersensitive reactions are mediated by T cells. The reaction occurs hours and possibly even days after contact with the allergen. Contact on the skin with an allergen is more likely to cause a delayed allergic reaction.



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