before_revision: The United States has only seen one case of Mad Cow disease which was in 2005 when a cow tested positive for the disease. Officials later linked the isolated case to Canada because the cow was born on a farm in Alberta. 
after_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.
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edit_actions: The later test was done in England where samples tested had conflicting results in 2004.
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