Article 12 Experimental animals shall be fed with wholesome feed that is up to standard in quality, animals, the second, clean animals, the third,animals carrying no specific pathogens and the fourth, animals carrying no bacteria.

• 第十二条 实验动物分为四级：一级，普通动物； 二级，清洁动物； 三级，无特 定病原体动物； 四级，无菌动物。