In strains of Escherichia coli O167 a single plasmid encodes for the coli surface antigens CS5 and CS6 of putative colonization factor PCF8775, heat-stable enterotoxin, and colicin Ia

Twenty Escherichia coli strains of serogroup O167 were examined. They all produced the two surface antigens CS5 and CS6 of the putative colonization factor PCF8775, together with heat-stable enterotoxin and colicin Ia. A plasmid coding for CS5, CS6, heat-stable enterotoxin, and colicin Ia was demonstrated in each strain.