Scientists at Imperial College London have discovered that a virulent strain of E coli harpoons itself to the human gut. Quentin Coopertalks to Dr Gadi Frankel and Dr Steve Matthews about E coli strain 0157:H7. The scientists hope that a better understanding oftheway0157:H7 attaches itself to the intestine will help them develop new drugs and vaccines to combat the deadly bacteria. Producer John Watkins. E-MAIL: material.world@bbc.co.uk