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Composition of cecal microbiota of broiler chickens at the phylum level (a) and comparison of relative abundances of the dominant phylum within different groups (b, c, d, e). Values are presented as mean ± SEM. NC non-infected and untreated negative control, PC ST-infected positive control without probiotics addition, EF E. faecium-treated group without ST infection, PEF both E. faecium-treated and ST-infected group. ST Salmonella Typhimurium
