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Anaphylaxis is an acute, life-threatening reaction that can occur due to a variety of triggers. It is often associated with allergen exposure, such as food, venom, or medications; however, there are other less-common causes, and many patients are ultimately classified as idiopathic. In this report, we described a patient with recurrent reactions attributed to food exposure. Further evaluation revealed an alternative, less common diagnosis.Background Terminal complement component deficiencies are risk factors for neisserial infections. O