Schaudinn, Fritz (frĭts shouˈdĭn) [key], 1871–1906, German zoologist. He confirmed the work of Sir Ronald Ross and G. B. Grassi on malaria, investigated amoebic dysentery, and in his research on protozoa discovered (1905) with Erich Hoffmann the Treponema pallidum (or Spirochaeta pallida ) of syphilis.
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