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A gene probe derived from the colonization factor antigen I (CFA/I) operon cross-hybridized at very low stringency to plasmid DNA from coli surface antigen 17 (CS17)-producing enterotoxigenic Escherichia coli (ETEC) and from the ETEC strain F595C, which was negative for previously described CFAs, CSs, and putative colonization factors (PCFs). A 16-kDa protein was identified in sodium dodecyl sulfate-polyacrylamide gel electrophoresis of heat extracts prepared after growth of strain F595C atdoi:10.1128/iai.65.2.507-513.1997 fatcat:mewaijqemzf55laxm5vcwijzcy