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J Bacteriol. 1968 December; 96(6): 1947-1952
Copyright © 1968 American Society for Microbiology. All Rights Reserved.

Production of and Sensitivity to Colicins Among Serologically Classified Strains of Escherichia coli

Division of Infectious Diseases, Department of Medicine, Stanford University School of Medicine, Palo Alto, California 94304

ABSTRACT

A significant proportion of 242 serologically classified strains of Escherichia coli of human origin produced colicins (33%) or were inhibited by one or more of six standard colicins (57%). The most common colicins identified were E1, I, and B; colicins B and V had greatest range of activity. Generally, neither the production of, nor sensitivity to, individual colicins was restricted to strains of a single serogroup. The coexistence of strains of one serogroup that were sensitive to the action of a colicin produced by strains of another serogroup was encountered among 2 of 21 fecal specimens containing strains of multiple serogroups. The production of colicins was not a major determinant in the acquistion of, or subsequent changes in, strains of E. coli in the feces of 10 newborn infants.