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The term originated from the story of Ignaz Semmelweis, who discovered that childbed fever mortality rates reduced ten-fold when doctors washed their hands with a chlorine solution between patients and, most in particular, after an autopsy (the institution where Semmelweis worked, a university hospital, performed autopsies on every deceased patient). Semmelweis decision stopped the ongoing contamination of patients --mostly pregnant women-- with "cadaverous particles"<Levitt, Steven D - Super Freakanomics, chapter 4>. His hand-washing suggestions were rejected by his contemporaries, often for non-medical reasons. For instance, some doctors refused to believe that a gentleman's hands could transmit disease (see Contemporary reaction to Ignaz Semmelweis).
While there is some uncertainty regarding the origin and generally accepted use of the expression, the expression Semmelweis Reflex has been documented and at least used by the author Robert Anton Wilson. In his book The Game of Life, Timothy Leary provided the following polemical definition of the Semmelweis reflex: "Mob behavior found among primates and larval hominids on undeveloped planets, in which a discovery of important scientific fact is punished". The expression has found way into philosophy and religious studies as "unmitigated Humean skepticism concerning causality".
- Wilson, Robert Anton (1991). The Game of Life. New Falcon Publications. ISBN 1561840505.