Enterohemorrhagic E.coli (EHEC) has caused severe food poisoning outbreaks

Enterohemorrhagic  E.coli (EHEC) has caused severe food poisoning outbreaks in the United States and elsewhere.  In order for the EHEC to colonize the host intestinal epithelium, it must have a mechanism for attachment. When EHEC are grown in vitro with cultured human epithelium cells, the bacteria, the bacteria can form fibrils that attach them to the epithelial cells. Design a microscopic method to simultaneously visualize EHEC and the human epithelial cells and briefly discuss why you choose that particular type of microscope over others.