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Effect of modifications of product formulation on the cumulative probability distribution of L. monocytogenes concentration in contaminated pork shoulder packages (product 87 in Table 1) at the end of the shelf life. □, current formulation (pH = 5.49, aw = 0.943, NaNO2 = 50 ppm); ○, modified formulation (pH = 5.49, aw = 0.930, NaNO2 = 100 ppm). Dotted lines indicate the level corresponding to compliance with the new safety criteria.
