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The toxic chemical melamine has now been identified in 22 different brands of milk powder.
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At least six children died in 2008 after drinking milk contaminated by the industrial chemical melamine.
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In Hong Kong a three-year-old girl has developed a kidney stone after drinking milk laced with the toxic chemical melamine.
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Two food processors in China are suspected of adding the chemical melamine to vegetable proteins used in feed for pets, hogs, poultry and fish.
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Chinese powdered milk laced with industrial chemical melamine has been blamed for causing four deaths in China so far and making thousands more ill.
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Earlier this week it set standards for "ready to eat" bagged salads and the chemical melamine, which tainted Chinese milk in 2008.