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The revival and wide use of tuberculin in the last few years has led a comparatively large number of makers of biologic products to place the different kinds of tuberculin in most common use on the market. As made by several of these firms, preparations like T. R. and B. E., presumably of the same strength, really contain a different amount of the tubercle solids in the concentrated solutions.
In reading reports concerning patients under treatment, therefore, the dosage mentioned may be actually quite different from that which the reader has in mind from the figures given. As a rule, these firms also use different systems of nomenclature in numbering their dilutions. As a consequence physicians in the West not infrequently have patients referred to them with letters concerning the dosage of tuberculin previously used, the exact meaning of which dosage it is not always easy to understand.
KRESS GH. CONVENIENT TABLE IN THE USE OF TUBERCULINS. JAMA. 1911;LVI(17):1252–1253. doi:10.1001/jama.1911.02560170016005
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