shows the comparative microbial inactivation efficacy of
different treatments on lettuce. The initial numbers for YM and TBC
were 4.50 and 5.90 log cfu/g, respectively. Treatment group 3
(SAEWeWW) slightly enhanced all microbial numbers reduction
compared with group 2 (SAEW). Treatment group 4 (SAEW þ US)
significantly (p 0.05) enhanced the reduction of E. coli and
L. monocytogenes. But same as Chinese cabbage, it also slightly
decreased the reduction of YM on lettuce compared with SAEW
treatment alone (group 2). Treatment group 5 (SAEW þ USeWW),
significantly more efficient compared to the two other combined
treatment groups, resulted in maximum reductions of 2.25, 2.40,
2.50 and 2.60 log cfu/g for YM, TBC, E. coli and L. monocytogenes,
respectively.