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Lungs, Asthma & Allergies
Asthma, allergies and respiratory conditions.

Key points
- Allergies are hypersensitive immune responses to substances that either enter or come in contact with the body, such as pet dander, pollen or bee venom.
- A substance that causes an allergic reaction is called an "allergen".
- Allergens can be found in food, drinks or the environment.
- Most allergens are harmless, i.e. the majority of people are not affected by them.
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