PCR products representing genes for Sat, SepA, Pic, SigA and Pet were separated in 1.2% agarose gels. (A) PCR products from 11 EAEC strains (B) PCR products from 12 Shigella strains. EAEC strain 042 is the positive control for pet and pic; S. flexneri 2a strain 2457T is the positive control for sat, sepA, pic and sigA.