How Well Do You Understand Your Walnut, Cashew, Brazil Nut, And/Or Hazelnut Allergy?
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How Well Do You Understand Your Walnut, Cashew, Brazil Nut, and/or Hazelnut Allergy? A positive blood or skin prick test to a tree nut means that a person Hazelnut is among the top is sensitized to that tree nut. But sensitization to tree nuts isn’t the whole 5 causes of serious food story. To truly understand your allergy, it helps to understand the tree nut allergic reactions¹ component proteins that your body may be reacting to. What proteins in tree nuts are causing your symptoms? A certain subset of tree nut proteins “look” so much like proteins found in other foods and pollens that the body mistakes these tree nut proteins for their “look-alike” family members such as cross-reactive carbohydrate determinants (CCD) or Profilin. This is called cross-reactivity. If your body is reacting to only these tree nut proteins, you are less likely to be at risk for a severe clinical reaction.2 Alternatively, if you are reactive to the LTP or storage protein family component members, you are more at risk for a severe reaction.2-5 Cross-reactivity Risk Decreasing levels of cross-reactivity Increasing risk to cause a serious allergic reaction Storage CCD Profilin PR-10 LTP Proteins Hazelnut Cor a 1 Cor a 8 Cor a 9, 14 Walnut Jug r 3 Jug r 1 Brazil nut Ber e 1 Cashew nut Ana o 3 What does your specific IgE sensitization mean? KEY: +Sensitized -Non-sensitized Depending on which family of component proteins you’re sensitized to, you’ll have a better idea of how to manage your tree nut allergy. This handy chart breaks it down for you.2,6-9 CCD, Profilin, PR-10 LTP Storage Proteins Oral food challenge (OFC) with a specialist may be recommended. High likelihood that patient may pass OFC. If patient passes an OFC: + - - • Foods prepared with or around the specific tree nut may be consumed. • Patient can consume the specific tree nut as guided by their healthcare provider. • If there is no clinical history of symptoms, please see considerations above. +/- + - • If there is a clinical history of symptoms, please see considerations below. 1. Nicolaou N, Poorafshar M, Murray C, et al. Allergy or tolerance• in children Choose sensitized to peanut: nut-free prevalence and differentiationzones using for component-resolved patient’s diagnostics. safety. J Allergy Clin Immunol. 2010;125(1):191-197. 2. Bradshaw N, A Clinical Reference Guide to Molecular Allergy. Go Molecular! Molecular Allergy –The Basics, 2014. 3. Katelaris CH: Food allergy and oral allergy or pollen-food syndrome. Curr Opin Allergy Clin Immunol 2010, 10:246–251. 4. Asarnoj A, Nilsson C, Lidholm J, et al. Peanut component Ara h 8 sensitization and tolerance to peanut. 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Anaphylaxis from Brazil nut. Allergy 54, 1999 / 1004-1013. 9. Schussler E et al. Allergen component testing in the diagnosis of food allergy. Curr Allergy Asthma Rep 2015; 15:55. © 2020 Thermo Fisher Scientific Inc. All rights reserved. All trademarks are the property of Thermo Fisher Scientific and its subsidiaries unless otherwise specified. .