In 1882 a solemn, nearsighted little German with a genius for laboratory detection made an international sensation by announcing that he had isolated the thin, curved bacillus which causes tuberculosis. Eight years later he sent another thrill around the world by telling about a substance, tuberculin, which he thought would destroy the bacillus, cure its human victims. But black days were ahead. Despite the other bacteriological triumphs of this onetime country doctor, it saddened the rest of Robert Koch's life when his tuberculin not only failed to cure consumptives but killed a good...
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