if their animals show signs of loss of appetite, lethargy or vomiting.
It received over 14,000 such reports in the first four weeks since March 15, more than twice the number of complaints typically received in a year for all of the products the agency regulates.
Federal testing of some of the cat and dog food and the wheat gluten used in their production turned up the chemical melamine, which can be toxic in high doses.
Melamine is a molecule that has a number of industrial uses, including use in manufacturing cooking utensils. It has no approved use in human or animal food in the United States, nor is it permitted to be used as fertilizer, as it is in some parts of the world.
FDA is not 100 percent certain that melamine, a relatively non-toxic substance, is the cause of the spate of pet illnesses and deaths. Although some studies have shown a toxic effect of melamine in rodents, research is scarce on melamine's effect on cats and dogs.
Now the FDA must attempt to determine whether or not it is the melamine itself that is the culprit, or whether it's some other contaminant associated with the melamine.
Anyway the association between melamine in the kidneys of cats that died and melamine in the food they consumed is undeniable, it says.
At this time in the ongoing investigation, there is no evidence that any imported wheat gluten contaminated with melamine has entered the U.S. human food supply, says Michael Rogers, Director of FDA's Division of Field Investigations. As an added precaution, however, FDA has asked the Centers for Disease Control and Prevention to use its surveillance network to monitor signs of human illness that could indicate contamination of the human food supply.
Earlier, the New York State Food Laboratory identified aminopterin, a cancer drug also used as rat poison, as the likely culprit in the pet food. But the FDA Administration said it could not confirm that finding.
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