Anitа Bаker, 17 yeаrs оld, and her rооmmate Rosetta Thorpe were celebrating a friend’s birthday at a dessert buffet at a local restaurant when Anita developed acute dyspnea, and angioedema. She complained of an itchy rash, and then had difficulty swallowing. Rosetta drove Anita to the emergency room two blocks away rather than wait for an ambulance. As they approached the hospital, Anita lost consciousness and was immediately treated by subcutaneous injection of epinephrine. Although much is unknown about the causes and progression of such conditions, which of the following is ALWAYS TRUE concerning allergy like Anita’s?