The U.S. bacterial limit is no more than 500 colony-forming units of bacteria per milliliter of water.
美国的细菌数量上限是每毫升水不超过500个菌落形成单位。
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Shopping cart handles led the way with 1100 colonyforming units of bacteria per 10 sq cm, followed by a mouse used on computers in Internet cafes, which had an average of 690 colonyforming units.