DNA test results show the first U.S. animal infected with mad cow was born in Canada, U.S. and Canadian officials said on Tuesday, a link that could allow the United States to still claim to be free of the brain-wasting ailment.
DNA test results show the first U.S. animal infected with mad cow was born in Canada, U.S. and Canadian officials said on Tuesday, a link that could allow the United States to still claim to be free of the brain-wasting ailment.
