Prof. Hermon-Taylor, together with Dr. Tim Bull and other members of the team at St George’s University of London and scientists at the Jenner Institute University of Oxford, developed a modern DNA vaccine against MAP, which is the bacteria suspected of being the primary catalyst for Crohn's Disease. Developing this vaccine took 10 years and cost around £850,000, much of it donated by the families of Crohn’s patients, without whom this new vaccine would not exist.