Second Instance of Mad Cow The U.S. Department of Agriculture says tests on a cow that had preliminarily tested positive for mad cow disease were negative. The results mark the second time in less than a week that an animal has prelimarily tested positive, and not had the disease. NPR's Joe Palca reports.
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Second Instance of Mad Cow

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Second Instance of Mad Cow

Second Instance of Mad Cow

Second Instance of Mad Cow

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  • <iframe src="https://www.npr.org/player/embed/3057034/3057035" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

The U.S. Department of Agriculture says tests on a cow that had preliminarily tested positive for mad cow disease were negative. The results mark the second time in less than a week that an animal has prelimarily tested positive, and not had the disease. NPR's Joe Palca reports.