Allergy immunotherapy (AIT), also known as allergy shots or hyposensitizing immunotherapy, is the treatment that can change the natural course of these diseases by affecting the mechanism that triggers or aggravates them. An allergy is a reaction of the immune system (IS) to something that does not bother most other people. The word is an apocope of the Greek words allos (different) and ergon (reaction), and was coined in 1906 by the Austrian pediatrician...