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Loads of us suffer from allergies. You probably know at least one person that has hayfever or is allergic to nuts. An allergy is a bad physical reaction to something. This something that you're allergic to is known as an allergen and it is often harmless to other people. The most common allergens are pollen, nuts, pets and dust. For most of us, allergies are simply annoying, but for some people the reactions can be really bad and can only be treated with medicine. |
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