Table 1.

Inactivation of E. coli O157:H7, S. enteritidis, and L. monocytogenes by EO water at 4 or 23°C

Bacterial speciesTemp (°C)Surviving bacterial population (mean log CFU/ml) after exposure for:EO water property
0 min5 min10 min15 minpHORP (mV)Free chlorine (ppm)
E. coliO157:H747.98 ± 0.04<1.0a 0b 0b
2.36 ± 0.031,153 ± 386.3 ± 5.4
Control7.98 ± 0.047.99 ± 0.077.96 ± 0.067.99 ± 0.04
S. enteritidis 7.74 ± 0.081.06 ± 0.150b 0b
2.48 ± 0.031,153 ± 283.5 ± 7.8
Control7.74 ± 0.087.68 ± 0.097.61 ± 0.117.60 ± 0.12
L. monocytogenes 7.91 ± 0.051.34 ± 0.370b 0b
2.63 ± 0.031,160 ± 443.0 ± 4.6
Control7.91 ± 0.057.88 ± 0.067.87 ± 0.067.91 ± 0.03
E. coliO157:H7238.04 ± 0.07<1.0a 0b 0b
2.37 ± 0.011,155 ± 182.3 ± 2.2
Control8.04 ± 0.077.97 ± 0.037.99 ± 0.077.76 ± 0.42
S. enteritidis 7.76 ± 0.08<1.0a 0b 0b
2.45 ± 0.121,151 ± 182.0 ± 5.8
Control7.76 ± 0.087.65 ± 0.097.73 ± 0.087.69 ± 0.10
L. monocytogenes 7.89 ± 0.101.25 ± 0.330b 0b
2.63 ± 0.041,158 ± 548.5 ± 4.1
Control7.89 ± 0.107.83 ± 0.067.85 ± 0.047.85 ± 0.07
  • a Positive by enrichment.

  • b Negative by enrichment and no detectable survivors by a direct plating procedure.