Control strains of E. coli using virulent specific primers.

Lane M: Generuler 1 kb plus (Fermentas); lane C: Multiplex of eae (EPEC), ipaH (EIEC), stx (EHEC), aggR (EAEC); lane 1: eae (881 bp); lane 2: ipaH (619 bp); lane 3: stx (518 bp); lane 4: aggR (254 bp) and lane N: negative control.