There are 2 allergens involved in allergy to brazil nuts.
Ber e 1 is a 2S seed storage albumin protein and Ber e 2 is a 11S globulin seed storage protein. Seed storage proteins are found in all nuts, causing people to be allergic to whole groups of tree nuts.
Brazil Nut allergy is not currently associated with any allergic syndromes.
Other food containing 2S albumin seed storage proteins are cashews, peanuts, almonds, mustard seed, rapeseed, turnip, chickpeas, hazelnuts, pistachio, buckwheat, soya beans, sunflower seeds, walnuts, kiwi, castor beans and sesame seeds.
There is a lot of cross reactivity between 2S and 11S seed storage proteins, the only other food containing 11S proteins not mentioned above is pumpkin.