After many experiments on the action of synthetic drugs upon spirochetal diseases, Ehrlich and Hata in 1909 discovered Arsphenamine (Salvarsan, "the arsenic that saves", also known as “606”), an effective treatment fo…
First demonstration of specific, acquired, lasting refractoriness to sensitization. This is the same or a closely related phenomenon to that demonstrated later by Burnet and Medawar under the name immune tolerance. Se…
