It was first identified in 1935 as part of the normal flora of newborns, but in the 1970's it was also identified as a cause of diarrhea secondary to the use of a broad spectrum of antibiotics in the hospital environment 2.
Identificada inicialmente en 1935 como parte de la flora normal de los recién nacidos y en la década de los setenta como agente causal de diarrea secundaria al uso de antibióticos de amplio espectro en el ámbito hospitalario 2.