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此处所提的免疫疗法是利用化学药品DNCB引起接触性皮炎,这种皮炎是属于一种延缓性质的过敏反应,称为延缓变态
The immunotherapy mentioned here is the use of the chemical drug DNCB to cause contact dermatitis. This dermatitis is an allergic reaction that is delayed in nature and it is called delaying metamorphosis.