Investigators looking into the first case of a BSE-infected cow in the U.S. believe the Holstein may have come from Canada and was more than six years old, predating the ban on certain cattle feed thought to cause BSE. Agriculture officials are trying to track down the other 81 cows brought to the U.S. with the infected one to test them as well. A spokesman for the National Cattlemen's Beef Association said that some of the infected cow may have been consumed, but the U.S. Agriculture Department maintains the risk to humans is "minuscule, if any risk at all."

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