One of the mechanisms by which normal intestinal microorganisms prevent attachment and colonization by enteropathogens has been proposed to be related to saturation of the adhesion receptors in the epithelium by normal microflora thus preventing attachment by pathogenic organisms (stavric and Kornegay, 1995). Bacitracin increased the bifiodobacteria counts in the jejunum and ileum and it has been suggested that bifidobacteria may attach preferentially to the intestinal epithelia and block attachment by harmful microflora such as E. coil (Meng et al., 1998).