You know food allergies and respiratory allergies. But you may not know that the two can cross each other as is sometimes the case for apple and birch, kiwi and hazelnut ... Dr Fanny Codreanu, allergist, answers our questions about cross-allergies.
What is cross-allergies?
- It happens that a child allergic to a food is also to this whole food group. This is an easy case to recognize.
- Other "crosses" are less obvious and connect food allergens from distant families or respiratory allergens, such as pollen. These cross reactions are not mandatory, but when a child is diagnosed as "food allergic", the specialist will systematically look for the existence of cross-allergies.
What are the symptoms ?
- In general, manifestations of allergy occur within minutes of ingestion of an unwanted allergen. The entire body of the child often develops eczema, accompanied by an urticaria around the mouth. His lips are swollen and prone to itching. He may also suffer from associated digestive disorders, such as vomiting or colic.
- In front of all these symptoms, it is important to consult an allergist. Thanks to a battery of tests (the prick-tests), the specialist will determine the culprit (s). For this, it deposits on the skin of the toddler drops of extracts of food allergens and respiratory, then spades to penetrate the molecules. At the place where the substance is allergenic, and within minutes of its application, redness and swelling appear.
- When the test is positive, the difficulty will be to assess whether your child is really allergic to the product or simply sensitized.
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