First it is necessary to find the source of a patient's allergy, and then these allergens are put into the body in tiny quantities and concentrations. These desensitize the body, until an environment with such allergens won't trigger an allergic reaction, or at least the symptoms will be greatly lessened.
首先要找出病人的過敏原，然後將過敏原打入病人體中，由低劑量、低濃度，慢慢適應到高劑量、高濃度，直到病人暴露在過敏原環境中可以不再產生症狀，或是症狀輕微。