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Growth of several bacterial strains in presence of GF, SPF and GF egg whites. The growth inhibition of S. aureus (A), S. uberis (B) was significantly higher in C and SPF hens as compared to GF (p < 0.001) while no differences were recorded among these three groups regarding the growth of L. monocytogenes (C), S. Enteritidis (D), S. Gallinarum (E) and E. coli (F). Germ free (GF), Specific Pathogen Free (SPF) and conventional (C) hens (n = 10, mean ± standard deviation).
