WARNING: Human food may be tainted like pet food

Last Thursday, the F.D.A. expanded its already large pet food recall after it found more evidence that an industrial chemical called melamine had contaminated the supplies of additional pet food makers, including Royal Canin US and C. J. Foods.

The agency, which has already recalled more than 60 million packages of pet food, is also investigating imports of rice protein from China.

Regulators in California said this week that they had found melamine in rice protein animal feed that was fed to livestock, and the fear is that the chemical could have entered the human food supply chain through hogs.

Laboratory testing in California had detected melamine in urine from hogs at the American Hog Farm in Ceres, Calif. California regulators have alerted anyone who purchased pork from American Hog Farm from April 3 to April 18 to be cautious.

“If the melamine level is high, it must have been added intentionally.” Liu Laiting, a professor of animal sciences at the Henan University of Technology.

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