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No schools were involved in that outbreak, but Miller called for an investigation to insure adequate safeguards are in place.
The Center for Science in the Public Interest is also concerned.
"E-coli is in ground beef because cow manure got into your food. So the fact that it continues to occur means there's a failure in the industry and the USDA to prevent the problem," said Sarah Klein from CSPI.
Congressional investigators reported in September that federal authorities don't always tell school cafeteria about tainted food product recalls.
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