The effect of Lactobacillus plantarum ZS2058 (ZS2058) and eugenol on the intestinal microbiota at 2 days post-ST infection. Mice were pre-treated with regular diet and PBS (ST), regular diet and ZS2058 (Z), eugenol-contained diet and PBS (E), or eugenol-contained diet and ZS2058 (ZE) for 10 days before Salmonella infection. The control mice (C) were also pre-treated with regular diet and PBS but were not infected. When sacrificed at 2 days post-infection, cecal contents were collected for sequencing. (A) Observed species, (B) Gini-Simpson’s index at genus levels, and (C) the ratio of Bacteroidetes/Firmicutes of each group. Data of quantity analysis are means ± SEMs, n = 5. Labelled means without a common letter are significantly different, p < 0.05.