Wild-type human EPEC strain E2348/69 adheres to small intestinal epithelial cells and induces typical A/E lesions in porcine ileal IVOC segments. HPS-stained sections showed the extensive foci of intimately adhered bacteria (HPS, arrow), as well as typical effacement of the brush border (**) and A/E lesions on TEM (arrowheads) and SEM ileal sections. BB, brush border. Magnifications: HPS, ×40; TEM, ×10,500; SEM, ×6,000.