The U.S. Department of Agriculture now believes the only two native-born U.S. cows to contract mad-cow disease were infected with a little understood and rare "atypical" strain that throws into question how the animals were infected.
Read the full story at CattleNetwork.com.
The USDA's chief veterinarian, John Clifford, said the latest two cases of bovine spongiform encephalopathy, or BSE, in the U.S. -- found in Alabama and Texas -- are abnormal, differing from the common form of the disease found in Canada and the U.K.
Clifford said the USDA has no plans to change the way it safeguards the U.S. beef supply.
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