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.
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Thomas et al. (1987) studied this question.
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