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Yersin', c1893. Alexandre Emile Jean Yersin (1863-1943), Swiss and naturalized French physician and bacteriologist. He discovered the bacillus responsible for the bubonic plague or pest, which was later named in his honour: Yersinia pestis. From the 2e collection [Felix Potin, c1893]. Artist Pierre Petit.. (Photo by The Print Collector/Getty Images)

Yersin', c1893. Alexandre Emile Jean Yersin (1863-1943), Swiss and naturalized French physician and bacteriologist. He discovered the bacillus responsible for the bubonic plague or pest, which was later named in his honour: Yersinia pestis. From the 2e collection [Felix Potin, c1893]. Artist Pierre Petit.. (Photo by The Print Collector/Getty Images)