I thought 292 VF would be too many to handle for this comparison so will grep few from the strains which are closer to the strain we are studying for German E-coli outbreak. based on the literature on this topic, I decided to take VF from some of the important EHEC strains i.e. O157:H7, O26, O111, found 89 records for O157:H7, and 1 each for O26 and O111, and also few VF from E-coli strain 55989.