Questions about example sentences with, and the definition and usage of "Sensitization"

A: It is used mainly in a medical or scientific sense in English.
It means getting accustomed to or responding to a stimulus.
It is used in allergy medicine to describe the process where people become sensitive (sensitized by repeated exposure) to an allergen.
They sometimes can give shots so that this sensitization is lessened.
Example: He received allergy shots to help in his desensitization to the cat allergens.