https://www.wwno.org/tags/mad-cow-disease mad cow disease en-US Copyright Wed, 25 Apr 2012 17:02:00 GMT https://www.wwno.org/food/2012-04-25/mad-cow-disease-what-you-need-to-know-now The food supply is safe, federal officials say, even though a fourth case of mad cow disease has been discovered in the United States. A 2009 ban on using cattle parts in animal feed may be why cases are so infrequent. Wed, 25 Apr 2012 17:02:00 GMT https://www.wwno.org/food/2012-04-25/mad-cow-disease-what-you-need-to-know-now Nancy Shute