NEW : `` They 're not looking very hard for mad cow disease , '' says critic of USDA . South Korea is the second-largest importer of beef from the United States . The country has been criticized by some in Congress and elsewhere over its handling of a recent outbreak that killed more than 100 people.
NEW : `` They 're not looking very hard for mad cow disease , '' says critic of USDA . South Korea is the second-largest importer of beef from the United States . In people , symptoms of mad cow disease include psychiatric and behavioral changes .