Comparative PCR analysis of STEC strains. Strains were analyzed by MPCR (top) and single-PCR approaches (bottom; EP1/EP2, bfp; SK1/SK2, eae; LP43/LP44, stx2; KS7/KS8, stx1). All strains exhibited the same gene pattern in the MPCR and single PCR assays and were positive for uidA; LEE (escV, eae); and stx1, stx2, or both. Lanes: M, marker; 1, 11062; 2, Y113; 3, 493/88; 4, 5720/96; 5, EDL933; 6, E. coli 04-2936; 7, E. coli 04-2938; 8, E. coli 04-3313; 9, E. coli 04-3453; 10, E. coli 04-4080.