Rare immunological term; the more common synonym is 脱感作 (だつかんさ). Used in medical contexts for reducing allergic sensitivity.
See also: 脱感作
In allergy treatment, desensitization therapy is sometimes performed.
Compound of 除 (じょ, 'remove') + 感作 (かんさ, 'sensitization'). The exact derivation is uncertain; it is a technical medical term.