Table 3.

Inactivation of E. coli O157:H7, S. enteritidis, and L. monocytogenes by EO water at 45°C

Bacterial speciesSurviving bacterial population (mean log CFU/ml) after exposure for:EO water property
0 min1 min3 min5 minpHORP (mV)Free chlorine (ppm)
E. coliO157:H77.96 ± 0.03 0b 0b 0b
2.39 ± 0.021,153 ± 485.8 ± 2.7
Control7.96 ± 0.037.89 ± 0.037.87 ± 0.037.86 ± 0.11
S. enteritidis 7.70 ± 0.121.13 ± 0.330b 0b
2.44 ± 0.031,155 ± 179.33 ± 3.0
Control7.70 ± 0.127.63 ± 0.127.67 ± 0.157.61 ± 0.14
L. monocytogenes 7.91 ± 0.10<1.0a 0b 0b
2.48 ± 0.051,159 ± 473.3 ± 1.8
Control7.91 ± 0.107.88 ± 0.107.88 ± 0.087.83 ± 0.12
  • a Positive by enrichment.

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