If you knew what possessed the young Jim Sacchettini to become a biochemist, you might look upon the "bar scene" more approvingly. But that story's for later. Instead, ponder what Sacchettini calls "the diseases of the poor" - infectious diseases that not long ago were considered wiped from the face of the Earth - tuberculosis and malaria, for instance. Sacchettini saw these maladies firsthand in the Bronx. He had gone there in 1990 from St. Louis, Mo.
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