Most allergies ? especially to airborne allergens associated with runny noses and itchy eyes ? come on in the teenage years or early twenties, according to Mark Moss, UW-Madison professor of pediatrics and immunology. Late allergy emergence is a bit of a mystery, Moss said, so much so that late-developing allergies aren?t seen as late-developing at all. If you have the potential for an allergic reaction, it?s probably always been there, waiting for the right mote of dust to waft by.
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