Similar plasmids that code for production of colonization factor antigen II and enterotoxins were mobilized into Escherichia coli K-12 from strains of E. coli O6.H16 biotype B or C that expressed colonization factor antigen II components CS2 and CS3. Further transfer experiments demonstrated that there was production of CS2 and CS3 in an O6.H16 biotype C strain, but there was expression of only CS3 in other serogroups and in E. coli K-12.
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