Fig. 2.

Microbial reduction caused by different combinations of washing treatments. (A) E. coli O157:H7. (B) S. Typhimurium. (C) Aerobic mesophilic counts. (D) Molds and yeasts. Count reduction indicates the difference in microbial counts between the control and treatment groups at the same time points. The different lowercase letters within the same group indicate significant differences (P < 0.05). US, ultrasound; TW, tap water; FC, free chlorine; CD, chlorine dioxide; PAA, peracetic acid; AA, ascorbic acid.