Table 1 Viability of biofilm-encased E. coli and L. monocytogenes (on lettuce or LDPE) after PUV treatment

E. coli O157:H7

Control (no PUV)

4.50 ± 0.34 A

4.40 ± 0.29 A

4.53 ± 0.35 A

4.04 ± 0.30 A

10 s—4.5 cm

1.97 ± 0.22 C

2.35 ± 0.27 B

0.99 ± 0.17 B

1.34 ± 0.23 B

20 s—4.5 cm

1.22 ± 0.20 C

1.74 ± 0.24 C

0.62 ± 0.15 C

1.20 ± 0.20 B

10 s—8.8 cm

2.61 ± 0.31 B

2.65 ± 0.29 B

1.23 ± 0.24 B

1.65 ± 0.24 B

20 s—8.8 cm

1.62 ± 0.25 C

2.04 ± 0.26 B

0.90 ± 0.16 B

1.38 ± 0.13 B

L. monocytogenes

Control (no PUV)

4.80 ± 0.35 A

4.70 ± 0.46 A

4.96 ± 0.32 A

4.71 ± 0.36 A

10 s—4.5 cm

3.39 ± 0.24 B

3.78 ± 0.37 B

1.17 ± 0.22 C

2.15 ± 0.31 B

20 s—4.5 cm

2.53 ± 0.22 C

2.88 ± 0.33 B

1.15 ± 0.20 C

1.88 ± 0.33 C

10 s—8.8 cm

3.90 ± 0.30 AB

4.10 ± 0.40 A

2.20 ± 0.32 B

2.80 ± 0.41 B

20 s—8.8 cm

2.83 ± 0.27 B

3.19 ± 0.36 B

1.67 ± 0.25 C

2.11 ± 0.36 B