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A person with Allergies is generally understood to have an immune system that over-reacts to normal and inocuous materials, such as pollen. The "allergy shot" is an injected solution containing a very dilute and small amount of these materials. The idea behind allergy shots is to continuously expose the immune system to very low levels of the material so that the immune system learns to "tolerate" the material and the person will stop having allergy symptoms.

Generally the person will need to be on allergy shots for the rest of his/her life - without constant low-level stimulation, the immune system tends to lose its tolerance and the allergy symptoms return.

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12y ago

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