Production of colicin E5 by epidemic strains of Salmonella typhimurium var. Copenhagen.

Sixty eight strains of Salmonella typhimurium were isolated during an outbreak of salmonellosis in the paediatric ward of Saadi hospital in Shiraz, Iran. Eleven of the strains were shown to produce a single type of colicin of group E. This colicin was identified as colicin E5. Most of the colicinogenic strains exhibited similar drug sensitivity and phage typing patterns and all were of the serotype S. typhimurium var. Copenhagen.