Rene Dubos isolates gramicidin, an antibiotic, from a common soil microbe

In 1939, Rene Dubos isolates gramicidin, an antibiotic, from a common soil microbe. His discovery helps cure a mastitis outbreak in the Borden Company’s cow herd, including the famed Elsie, at the 1939’s World’s Fair.

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Source: U.S. National Library of Medicine
Credit: Photo: Courtesy U.S. National Library of Medicine.