Semmelweis Ignaz PhilippSem·mel·weis
, Ignaz Philipp Originally Ignác F&udie;l&odie;p Semmelweis. 1818–1865.
Hungarian physician who determined that puerperal fever in a maternity clinic in Vienna was spread by doctors and students who examined pregnant women directly after performing autopsies. The mortality rate dropped after he required staff members to disinfect their hands before examinations.