Jaspar Lawrence believes he has found the cure for (or at least respite from) hay fever, Crohn’s disease and multiple sclerosis: a parasite known as the hookworm. He breeds the worms and sells them by mail order to people desperate to get some relief from their symptoms, and he has many loyal and grateful customers. Lawrence’s own allergies were relieved after he spent time in the Cameroonian bush stepping in human faeces with his bare feet in order to become infected. Four years ago a team of scientists at Nottingham University infected themselves with hookworms to test the theory that they could help people overcome their allergies. Read more about Lawrence’s controversial attempt to commercialise the treatement in The Observer.