Ornidazole (200 mg/kg, 400 mg/kg) was given to the LD and HD groups, and 0.5% carboxymethylcellulose sodium (CMC) administered to the normal control, all for 20 consecutive days.

• 低剂量组和高剂量组分别给予 200、400mg/kg奥硝唑灌胃；正常对照组给予0.；5%25羧甲基纤维素钠灌胃；连续 20d。