Allergic reactions are most likely to be caused by Bet v 1-like proteins, which cause reactions in people sensitised to birch tree pollen and give oral allergy type symptoms.
Another suggestion is that plants in the Apiaceae family contain profilin proteins which can cause allergic reactions in uncommon circumstances.
Allergy to fennel is loosely linked to Pollen Food Allergy Syndrome. You may have Pollen-Food Allergy Syndrome if you suffer from dill allergy with oral allergy symptoms to 3 or more of the foods mentioned in the cross reactivity section.
Fennel is in the family Apiaceae, other spices in this family are coriander, caraway seed, celery, chervil, cumin, dill, aniseed and parsley.
If sensitised to Birch pollen you may have Pollen Food Allergy Syndrome and may also react to Apple, Carrot, Kiwi, Pear, Peach, Plum, Nectarine, Apricots, Cherries, Tomato, Celery, Potato, Parsnip, Pepper, Cumin, Peas, Dill, Aniseed, Hazelnut, Walnut, Almonds, Coriander, Peanuts, Lentils and Beans.
InformAll - The University of Manchester - Spice Allergies
Characterization of allergens in Apiaceae spices: anise, fennel, coriander and cumin, 2006
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