"It is often said that, although homeopathy does no good, at least it does not harm. But that is not true if using homeopathy delays diagnosis of serious disease like cancer. It is not true if homeopaths persuade you not to be vaccinated, and as a consequence you get smallpox, mumps, measles, and spread them in the community. And it is not true if you listen to the ill-informed advice that is given by many homeopaths about how to avoid malaria when you visit countries where it is common….. On the programme, Melanie Oxley, from the Society of Homeopaths, wriggled uncomfortably when faced with the evidence (and Simon Singh). She protested that members of her organisation do not advise against proper malaria prevention, or against vaccination…. Well, they DO. So much for 'professional regulation'. You cannot regulate the delusional and the attempts of organisations like Oxley's clearly don't work. Apart from their inability to stop their members giving lethal advice, the regulators themselves are deluded." David Colquhoun, A. J. Clark Professor of Pharmacology, University College London (14th July 2006)