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" ... In 1894, the Pasteur Institute sent bacteriologist Yersin to Hong Kong to investigate an epidemic of bubonic plague. The disease had already killed more than 40,000 people as it swept through southern China. Bubonic plague normally kills between 30% and 60% of its victims without treatment, but the 1894 outbreak proved to be an even more efficient killer, because at some point the pathogen had taken hold in a person's lungs. When that person coughed, they spread airborne droplets of plague to everyone nearby -- and untreated pneumonic plague is nearly always fatal. ... "