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Prevalences in terms of the number of eggs contaminated (internally and externally) with Salmonella Enteritidis per million are presented based on a 2 stage Bayesian model. The first stage estimates the average flock prevalence over laying period in the production system and the second stage estimates the proportion of contaminated eggs for an infected flock. These are combined to give the expected number of infected eggs per million using the hen data from 2 European Union Member States (MSs).doi:10.2903/j.efsa.2010.1588 fatcat:7ao2l3ptebgptirnfwegyfdtoe