One of the mysteries of the English language finally explained.
Used attributive with reference to a test for immediate-type hypersensitivity involving the injection of serum from an allergic subject into the skin of another individual, followed after 1–2 days by injection of the allergen, which produces a weal if sensitizing antibody (IgE) is present.
1920s. From the names of Carl Willy Prausnitz and Heinz Küstner, German bacteriologists, who described the reaction involved.
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