before_revision: The United States has seen two cases of Mad Cow disease which were in 2005 when a cow tested positive for the disease . Officials later linked one of the cases to Canada because the cow was born on a farm in Alberta. The later test was done in England where samples tested had conflicting results in 2004.
after_revision: The United States has seen two cases of Mad Cow disease . The first was discovered in December of 2003 in the state of Washington . Officials later linked this case to Canada because the cow was born on a farm in Alberta. The second infected cow was discovered in Texas in 2005. The later case was diagnosed in England after earlier samples tested had shown conflicting results.
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