Advances in meat animal production in the last twenty years are unprecedented in the history of agriculture. Despite the intensive research in medicine and animal health, disease continues to contribute tremendous economic loss in animal production by direct death loss, decreased feed efficiency, and longer production time. Enteritis of various etiologies, especially in the neonate, is probably the most visible in terms of death loss, and paradoxically, also one of the most insidious causes of economic loss in subclinical cases or cases of permanent intestinal dysfunction.