A woman suffered a severe allergic reaction after tests showed she was essentially 'allergic to everything.'Ploy Ling, 23, an engineer, underwent allergy testing in August after she developed sinus issues, which started when she adopted two cats. Doctors injected her with more than 50 allergens as part of a standard skin prick test, which inserts small amounts of allergens into the skin to check for possible reactions. However, after five minutes, Ms Ling realized something was very wrong. She had trouble breathing, and her heart was pounding.
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