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It's the worst nightmare for anyone with a life-threatening food allergy. On Jan. 11, Órla Baxendale, 25, a Manchester, England, native living in New York, ate a vanilla Florentine cookie at a social ...

Anaphylaxis is a serious, potentially life-threatening allergic reaction that can affect several organ systems in the body and may threaten breathing and blood circulation. The most common causes of ...