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Several samples of infant formula have tested positive for trace amounts of the toxic contaminant melamine or a related compound, the Food and Drug Administration said Thursday.

Of 77 samples tested, one contained trace levels of melamine, FDA spokeswoman Judy Leon told CNN. A trace amount is defined as less than 2,500 parts per billion, she said.

On Tuesday, the agency had said that one sample had tested positive.

But Thursday, the FDA said two tests of a sample of Nestle's Good Start Supreme Infant Formula with Iron showed melamine at levels of 137 and 140 parts per billion.

In addition, Mead Johnson's infant powder, Enfamil LIPIL with Iron, had three positive tests for cyanuric acid, at an average of 247 parts per billion, also well below the FDA trace level. Read full article »

CNN's Saundra Young contributed to this report

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