NEW : `` They 're not looking very hard for mad cow disease , '' says critic of USDA . The first U.S. case of mad cow disease in six years sparked fears of illness that prompted at least one major South Korean retailer to suspend the sale of American beef . 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 . The country has been criticized by some in Congress and elsewhere over its handling of a recent outbreak that killed more than 100 people.