PCR tests of the toxins and adhesions of the three ETEC strains. The tested strains were E .coli strains 195 (F4ab ETEC), 200 (F4ac ETEC) and 8813 (F18ac ETEC), n = 2 for each gene. “M” was DL2000 DNA markers. “-” was negative control; F4 (faeG) (499 bp), F4 (K88) (792 bp) and F18 (fedA) (313 bp) were positive controls. E .coli strains 195, 200 and 8813 were all positive for LT (281 bp), STb (172 bp), and EAST1 (111 bp), meanwhile, E .coli strains 200 was also positive for STa.