Cows Engineered for Immunity to Mad Cow Disease (NPR) Scientists have created a dozen cattle that seem to be immune to mad cow disease. The animals, now 2 years old, have been genetically engineered to lack the protein that's susceptible to the disease. [News Source]

Cows Engineered for Immunity to Mad Cow Disease (NPR) Scientists have created a dozen cattle that seem to be immune to mad cow disease. The animals, now two, have been genetically engineered to lack the protein that's susceptible to the disease. [News Source]