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NIH physician Dr. Joseph Goldberger's discovery of the cause for pellagra, a disease, resulting from a diet deficient in vitamin B, that killed many poor Southerners in the early part of the 20th century.
  Man With Pellagra  
   
  man with pellagra  
     
  Pellagra, a loathsome skin disease, it was called mal de la rosa and often mistaken for leprosy. In the United States, pellagra has often been called the disease of the four D's -- dermatitis, diarrhea, dementia, and death.  
     
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