With flukes and other intestinal worms there is no way of accurately testing for their presence with the usual stool exams done in most labs. CDC is basing their report on stool exams that are known to be highly innacurate. Alternative proactitioners using different techniques, such as Hulda Clark 's synchrometer, do find that many people carry liver flukes in the US population. The infestation is acquired by eating raw or undercooked meat that has been contaminated by bile from a meat animal, usually cows.