The fear and outrage surrounding the death of beloved Fidos and Fifis around the country from contaminated pet food isn't going away. Another recall was announced on Thursday, as officials added pet treats made by Sunshine Mills, a company based in Red Bay, Alabama, to the list of retracted products, because of the possibility it may have used contaminated wheat gluten. And Menu Foods Ltd. — which announced its first recall of 60 million dog and cat food products packaged under various brand names three weeks ago — extended the recall date to foods made between Nov. 8 and Mar. 6.
What Caused the Deaths?Richard Goldstein, associate professor of medicine at Cornell University College of Veterinary Medicine, who is part of a Cornell team investigating the cause of death, says he would not normally expect melamine to kill a pet. Research on melamine's effects on animals is very limited: only a few dated studies have been done on dogs and just one on cats, which showed limited poisonous effects and no kidney damage. And melamine has a very low level of toxicity to rodents. "It looks like it
is causing direct cell death in the kidneys and this is not something we would have expected to happen," says Goldstein. "I don't think it's pure melamine. Maybe there is some kind of reaction with the metabolism of melamine that would cause this."
A growing number of complaints about sick and dying animals who ate only dry food, which typically does not contain wheat gluten, is another reason some authorities question whether melamine is the real culprit. Bruce Friedrich, Vice President of People for the Ethical Treatment of Animals (PETA) has urged the FDA to test for excessive levels of vitamin D; last year a manufacturing error led to too much of the vitamin in Royal Canin pet food, causing kidney failure and death in several animals. But Goldstein says excessive vitamin D is unlikely, since blood tests would show high calcium levels, which haven't been found. Says an FDA spokesman: "Our analysis of the premix indicates that vitamin levels were appropriate." Other theories floated to explain the bizarre deaths are aminopterin, or rat poison, which would cause the kind of kidney damage seen. An Albany lab found the substance in two pet food samples of canned foods, but the FDA has ruled these out because no other lab has been able to confirm the results.
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