The concentration of the SFP in the product is a stochastic quantity. In order to establish the probability density function (PDF) for presence of the SFP in certain concentration in the product, historic data on the incidence, prevalence and count of pathogens in the product are required. This information has to be collected through testing of the product over certain period of time, e.g., 1 year, in order to produce reliable data. The testing would also provide data to determine the probability for cross contamination in the SC. The length of the required period depends on how often the testing is performed. The PDF for finding certain number of cells of certain pathogen bacteria in the SC can be further used in the exposure assessment, i.e., in the microbial growth models.