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Isolation of E. faecalis (Ef) and E. coli (Ec) from the yolk at 48 h, 6, and 8 d following exposure of incubating eggs to different doses of E. faecalis, E. coli or co infection with E. faecalis and E. coli. (Experiment B: E. faecalis and E. coli coinfection in chicken embryos and subsequent mortality and pathology in neonatal chickens).
