The Semmelweis reflex or "Semmelweis effect" is a metaphor for the reflex

Reflex

A reflex action, also known as a reflex, is an involuntary and nearly instantaneous movement in response to a stimulus. A true reflex is a behavior which is mediated via the reflex arc; this does not apply to casual uses of the term 'reflex'.-See also:...

-like tendency to reject new evidence or new knowledge because it contradicts established norms, beliefs or paradigm

Paradigm

The word paradigm has been used in science to describe distinct concepts. It comes from Greek "παράδειγμα" , "pattern, example, sample" from the verb "παραδείκνυμι" , "exhibit, represent, expose" and that from "παρά" , "beside, beyond" + "δείκνυμι" , "to show, to point out".The original Greek...

s.

The term originated from Ignaz Semmelweis

Ignaz Semmelweis

Ignaz Philipp Semmelweis was a Hungarian physician now known as an early pioneer of antiseptic procedures. Described as the "savior of mothers", Semmelweis discovered that the incidence of puerperal fever could be drastically cut by the use of hand disinfection in obstetrical clinics...

, who discovered that childbed fever mortality rates could be reduced ten-fold if doctors would wash their hands (we would now say disinfect) with a chlorine solution between having contact with infected patients and non-infected patients. His hand-washing suggestions were rejected by his contemporaries (see Contemporary reaction to Ignaz Semmelweis

Contemporary reaction to Ignaz Semmelweis

Dr. Ignaz Semmelweis discovered in 1847 that hand-washing with a solution of chlorinated lime reduced the incidence of fatal childbed fever tenfold in maternity institutions...

).