The CDC and FDA do not now support the use of antibiotics for growth promotion because of evidence suggesting that antibiotics used for growth promotion purposes could lead to the development of resistant bacteria.[1] In addition to this, The Pew Charitable Trusts has stated that "hundreds of scientific studies conducted over four decades demonstrate that feeding low doses of antibiotics to livestock breeds antibiotic-resistant superbugs that can infect people".[162] The FDA, the U.S. Department of Agriculture and the Centers for Disease Control and Prevention have all testified before Congress that there is a definitive link between the routine, non-therapeutic use of antibiotics in food animal production and the challenge of antibiotic resistance in humans."[163] However, the National Pork Board, a government-owned corporation of the United States, has said: "The vast majority of producers use (antibiotics) appropriately."[164] In 2011 the National Pork Producers Council, an American trade association, also said, "Not only is there no scientific study linking antibiotic use in food animals to antibiotic resistance in humans, as the US pork industry has continually pointed out, but there isn't even adequate data to conduct a study."[165] The statement was issued in response to a United States Government Accountability Office report that asserts: "Antibiotic use in food animals contributes to the emergence of resistant bacteria that may affect humans".[166]