Robert Koch (1843-1910), German bacteriologist and physician in his laboratory.
Robert Koch (1843-1910, German bacteriologist and physician in his laboratory. In 1890 Koch introduced Tuberculin which he thought a cure for Tuberculosis. Curative powers disappointing and its value as diagnostic tool overlooked. Engraving, 1891. (Photo by Ann Ronan Pictures/Print Collector/Getty Images)

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