also: だっかんさ
noun
Medical term for reducing or eliminating an allergic or immune response through controlled exposure.
花粉症の治療として脱感作療法が行われることがある。
Desensitization therapy is sometimes performed as a treatment for hay fever.
Often used interchangeably with 脱感作, but 減感作 can imply a reduction in sensitivity rather than complete elimination.
Compound of 脱 (だつ, 'remove') + 感作 (かんさ, 'sensitization'). The term is a direct translation of the English 'desensitization' in an immunological context.