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Figure S1. A comparison of the observed proportion of eggs positive in study 1 (where contents and shells were tested together) versus the proportion of eggs positive in study 2 (where shells and contents were cultured separately).

Table S1. Description of the priors used in the Bayesian model determining the rate of egg contamination relative to infection prevalence and their source.

Table S2. The final 10-fold dilution to be positive for Salmonella for each of 20 pools of five faeces samples, taken from 20 flocks for which 10 g was initially mixed in 100 ml of BPW solution.

Table S3. Covariance and correlation between egg contents and egg shell contamination from a study of 20 farms (study 2).

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