JAMA. 1891;XVI(14):485-486. doi:10.1001/jama.1891.02410660017004.
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As we continue to receive letters from physicians in different parts of the country anxiously inquiring how and where they can obtain Koch's Lymph or Tuberculin with which to treat some of their consumptive patients, we think it proper to call the attention of all general practitioners to the present status of the Koch treatment, particularly in relation to pulmonary tuberculosis. And we would remind all inquirers that we know of no mode of obtaining a supply of the Tuberculin, except by application to Koch's laboratory in Berlin, Prussia. There is none in the drug market of this or any other country, and no one outside of Koch's laboratory knows how it is made, or precisely what its active ingredients are. The authorities at Berlin simply authorized the remedy to be furnished in limited quantities to be used in hospitals where the patients could be kept under constant observation, and


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