(CFU/g) O157:H7 K-12 Gene numbers (copies) Gene numbers (copies) 41 F – 1066R 41F – Eco - R 41 F – 1066R 41F – Eco - R Noncell control nd nd nd nd* 1×101 Living cells nd 34.0 ± 15 4.22 ± 2 81.0 ± 9 1×102 Living cells 6.24×103 ± 2179 119 ± 29 506 ± 159 111 ± 23 1×103 Living cells 6.95×103 ± 1125 0.73×103 ± 137 280 ± 99 3.43×103 ± 101 1×104 Living cells (6.83 ± 3.82)×104 2.81×104 ± 139 959 ± 313 2.63×104 ± 576 1×101 dead cells nd nd nd nd 1×102 dead cells nd nd nd nd 1×103 dead cells nd nd nd nd 1×104 dead cells nd nd nd nd *because they are not detected

Table 2: Gene numbers in cDNA extracted from food samples inoculated with living or dead cells.