(A). Relative eaeA gene expression of E. coli O157 in chicken fillet treated with CS-NPs and CS-LZ-NPs at chilling preservation. Values are expressed as the mean ±SD. There are significant differences between points that have different letters on the same day of preservation. (B). Relative stx gene expression of E. coli O157 in chicken fillet treated with CS-NPs and CS- LZ-NPs at chilling preservation. Values are expressed as the mean ±SD. There are significant differences between points that have different letters on the same day of preservation