Allergies
Immunity · Biology
Study notes
Peanut allergy can kill in minutes — anaphylaxis: throat swells shut, blood pressure crashes; an EpiPen's adrenaline reverses it instantly, which is why allergic children carry one. Hay fever's sneezing fits are the same IgE machinery misfiring on harmless pollen. Allergy shots (desensitization) retrain the system with tiny, increasing allergen doses.