Cross-protection is referred to as the ability of one stress condition to provide protection against other stresses. Microbial adaptation responses to one stress can lead to enhanced resistance to a different stress (Cheville and others 1996; Riordan 1998 A selection of stress-induced cross-protection studies are liste in Table 2. Both acid-shocked and-adapted cells showed crossprotection against heat or other stresses (Buchanan and Edelso 1999; Ryu and Beuchat 1999a, 1999b). Enhanced heat toleranc in TSB at 52 ° C and 54 C, and in apple cider and in orang juice at 52 SC was observed in acid-adapted. E. coli O157: H not in ocked cells (Ryu Buechat 1998). Aci adaptation induced significant cross-resistance to a wide range stress conditions, including heat, violet, an polymixin B as shown for Salmonella strains (Leyer and Johnso 1993; Lee. and others 1995)