RSS-PCR patterns of selected diarrheagenic E. coli isolates and Salmonella serovar Enteritidis strains. Lane 1, 1-kb molecular-weight ladder; lane 2, EHEC (E. coli O157:H7 pattern A [F4761]); lane 3, EHEC (E. coli O157:H7 pattern A1 [KSU 34]); lane 4, EPEC (O55:H7); lane 5, EPEC (O111:NM); lane 6, ETEC (strain H10407); lane 7, enteroaggregative E. coli (strain 25-2); lane 8, enteroinvasive E. coli (strain 11); lane 9, Salmonella serovar Enteritidis phage type 4; lane 10, Salmonella serovar Enteritidis phage type 8. Note the similarity between the patterns for E. coli O157:H7 and E. coli O55:H7 (lanes 2 and 4).