Are twins allergic to the same things?

Are twins allergic to the same things?

Source: The Conversation

An allergic reaction happens when your immune system overreacts to something that should be harmless. Whether that happens can be thanks to your genes, your environment or a combination.

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Are twins allergic to the same things? – Ella, age 7, Philadelphia
Allergies, whether spring sneez… [5559 chars]

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