Continuous ultrasound treatments led to a reduction of 2.65 ±
0.23 log CFU/cm2 of E. coli on the lettuce. No significant differenceswere found among the tested pulsed and continuousmodes.
In addition no significant differenceswere found between injured and no-injured cells among all
the applied treatments on the leaves of the lettuce. Application of the different concentrations of EO alone, at the
levels mentioned previously reduced the bacteria on the surface of the lettuce. Less than 2 logs of total inactivation
(on the lettuce and the treatedwater)were achievedwhen different concentrations of EO were tested alone.