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Microphotograph of Donovan bodies, indicating the sexually transmitted disease Donovanosis (Granuloma inguinale), 1971. Image courtesy CDC/Susan Lindsley. (Photo by Smith Collection/Gado/Getty Images)

Microphotograph of Donovan bodies, indicating the sexually transmitted disease Donovanosis (Granuloma inguinale), 1971. Image courtesy CDC/Susan Lindsley. (Photo by Smith Collection/Gado/Getty Images)