Flexner, Simon, 1863–1946, American pathologist, b. Louisville, Ky., M.D. Univ. of Louisville, 1889; brother of Abraham Flexner . He served with the Rockefeller Institute (now Rockfeller Univ.) from 1903 to 1935 (as its first director, 1920–35) and was Eastman professor at Oxford from 1937 to 1938. He worked on experimental epidemiology and venoms and is known especially for his serum treatment of cerebrospinal meningitis and for his studies of poliomyelitis. He also isolated a bacillus of dysentery.
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