In 1911, a British researcher named Leonard Noon attempted to do for hay fever what his predecessors had done for smallpox and rabies. Using small amounts of grass pollen, Noon injected 'pollen vaccines' into people suffering from grass allergy, gradually increasing the amounts to help build up a tolerance to the irritant. A century later, Noon's immunotolerance therapy has matured into a technique widely used by allergists, one that can be tailored for dozens of airborne allergens.
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