Abstract
Best1demonstrated, from the results of in vitro experiments, that a histamine inactivating substance existed. Later Best and McHenry2proved the specificity of this inactivating substance for histamine and accordingly suggested that the inactivating substance be known as histaminase. Histaminase has now become a popular drug for clinical experimentation in allergic diseases and allied disorders. The foundation for this clinical experimentation is based entirely on the hypothetical assumption that the allergic reaction is caused by the liberation of "H-substance" at the site of contact of antibody with antigen and on the probability that histaminase might inactivate the "H-substance," which is similar but not identical to histamine. Histaminase has been reported to be effective in the treatment of hay fever,3urticaria,4angioneurotic edema,5allergic eczema,6seborrheic eczema,5acne vulgaris,7Ménière's disease,5gastrointestinal allergy,8ulcerative colitis,9cold allergy10and serum

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