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What happens when a person who is allergic to ragweed encounters ragweed?

What happens when a person who is allergic to ragweed encounters ragweed?
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What happens when a person who is allergic to ragweed encounters ragweed?

User Marcelo Noronha
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Ragweed antigens bind ragweed and then bind mast cells which release histamine

Allergies develop because of a Th2 response against the allergen.

User Imre L
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