Table 1.

Viable and sublethal E. coli O157:H7 populations after low- and high-intensity ultrasound treatments.

Time (min)	Low-intensity ultrasound		High-intensity ultrasound
	TSA (log CFU/mL)	TSA + 2%NaCl (log CFU/mL)	TSA (log CFU/mL)	TSA + 2%NaCl (log CFU/mL)
5	7.91 ± 0.08c,C#	7.63 ± 0.07b,B	7.13 ± 0.07c,A	7.07 ± 0.05c,A
15	7.49 ± 0.06b,C	7.31 ± 0.07a,B	6.89 ± 0.09b,A	6.86 ± 0.10b,A
25	7.02 ± 0.05a,C	6.89 ± 0.06a,B	6.13 ± 0.07a,A	6.09 ± 0.06a,A

Initial bacterial population was approximately 8.27 ± 0.04 log CFU/mL. ^#Values are the mean of triplicate measurements ± standard deviation; values with different lowercase letters in the same column and uppercase letters in the same row showed a significant difference at P < 0.05.