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Comparison of gut microbial alpha-diversity in the AG and AC groups on days 7, 14, and 30. (A) Richness was assessed using the Chao1 estimator. (B) Evenness was assessed using Simpson's Evenness index. (C) Diversity was assessed using the Shannon index. AG, ampicillin-gentamicin group; AC, ampicillin-cefotaxime group. Boxes represent the interquartile range, lines indicate medians, and whiskers indicate the range. *Significant differences (P < 0.05).
