Bordet, Jules (zhül bôrdāˈ) [key], 1870–1961, Belgian serologist and immunologist, M.D. Univ. of Brussels, 1892. He became director of the Pasteur Institute in Brussels in 1901 and professor at the Univ. of Brussels in 1907. With Octave Gengou he devised (1900) the technique of the complement-fixation reaction (applied by Wassermann to the diagnosis of syphilis) and discovered (1906) the bacillus of whooping cough. For his work in immunity he received the 1919 Nobel Prize in Physiology or Medicine.
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