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Cefazolin changed the composition of fecal bacteria in the HC and AS groups. (A) 16S rRNA, (B) Firmicutes, (C) Bacteroidetes, (D) F/B ratio, (E) β-Proteobacteria, (F) γ/δ-Proteobacteria, (G) ε-Proteobacteria, and (H) Enterobacteriaceae. Data are shown as mean ± S.E.M. (n = 6 in each group). *P < 0.05 or **P < 0.01. AS: anesthesia and surgery; HC: healthy control; N.S.: not significant.
