Fig. 6

Microbial community of fecal samples in each procedure at the genus level. a Taxonomic composition and b relative abundance (min to max) of Campylobacter, Escherichia, and Proteus of fecal samples in each procedure. The relative abundance of Campylobacter in fecal samples in 10³–Preston broth was significantly higher than in other procedures. In the case of Escherichia-Shigella, the relative abundance was reduced, compared to feces, but was still present in large proportions in the process of 10¹-/10²-Bolton broth enrichment. In the case of Proteus, the relative abundance increased during the enrichment process in both enrichment broths, at all ratios of sample-to- broth, with the exception of 10³-Bolton broth