By: Michael Greger, M.D.Director of Public Health and Animal Agriculture at The Humane Society of the United States

The downer dairy cow recently found stricken with mad cow disease in California was infected with an "atypical" strain. Such cases are thought to arise spontaneously, a notion the USDA seized upon to explain how the disease could arise despite their regulations. If anything, that fact highlights the weaknesses in the current feed rules. If mad cow disease can arise out of nowhere, then it's even more important to close the loopholes and stop the feeding of cattle blood to calves and chicken manure to cows to prevent it from spreading. And what the USDA didn't mention about the atypical strain found in California is that there's evidence it's a more dangerous form of the disease.

 

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