http://www.phadia.com/en/Products/Allergy-testing-products/ImmunoCAP-Allergen-Information/Food-of-Plant-Origin/Vegetables/Broccoli-/ (http://www.phadia.com/en/Products/Allergy-testing-products/ImmunoCAP-Allergen-Information/Food-of-Plant-Origin/Vegetables/Broccoli-/)
Which basically confirms that any food can cause allergic reactions. Some are just more common than others. Still, an interesting read. I certainly haven't met anyone with broccoli allergy - yet!
DS outgrew* his broccoli allergy - he experienced throat itching and 3-4 random hives from it.
*Outgrew might not be the best term - his broccoli allergy went away with Xolair and has not come back even after being off of Xolair. Other food allergies have come back - some worse than before. :-[