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The most common cause of peanut allergy is eating peanuts or peanut-containing foods. Sometimes direct skin contact with peanuts can trigger an allergic reaction. Cross-contact. This is the unintended introduction of peanuts into a product. It's generally the result of a food being exposed to peanuts during processing or handling. Inhalation.
In one infamous instance in 1986, Katherine Brodsky, 18, a freshman at Brown University with a known nut allergy, died after eating chili that a restaurant had thickened with peanut butter. There is no cure for nut allergies, although several preliminary studies suggest that it may be possible to temper a reaction to peanuts with immunotherapy. Like shots given for pollen allergies, the approach starts with exposure under the tongue to a minuscule amount of the offending peanut protein, followed by exposure to gradually increasing amounts under strict medical supervision.