FDA: Tiny amount of melamine not harmful to adults

• Story Highlights
• FDA says eating tiny amount of melamine -- 2.5 parts per million -- not harmful
  
• Officials stress they won't tolerate any melamine deliberately added to food supply
  
• No safe level of melamine for infants
  
• Melamine-tainted formula has sickened 54,000, killed 4 children in China
  
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