Before inoculation, each suspension (25 mL) of L. monocytogenes
or E. coli O157:H7was added to 75 mL of 0.1% aseptic peptonewater
to adjust the concentration to 105e106 CFU/mL. Plums were then
inoculated with each inoculum by submersion in the solution at
25 C for 5 min. Inoculated plums were dried in a laminar-flow
hood for 30 min.