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Distribution of R Plasmids Among the O-Antigen Types of Escherichia coli Isolated from Various Clinical Sources

A total of 655 Escherichia coli strains from various clinical sources were O-antigen typed, and the serological properties were correlated with R-plasmid carriage. Of the 655 strains, 224 were resistant to one or more antibiotics and 148 of these carried R plasmids. The distribution of O-antigen types among the susceptible strains was similar to that reported previously by others in England. The O-antigen types among the R+ strains showed some similarities to those found in susceptible strains, but O-antigen types O8, O9, O17, O18 and, perhaps, O101 and O107 were more common in the R+ than in the susceptible series. There is therefore some overlap between the O-antigen types of E. coli prevalent in R+ strains from clinical cases and from human and animal fecal sources.