Oh dear, another own goal, at the worst possible time. It looked as if the MMR row was slowly ebbing away. The wide publicity given to Andrew Wakefield's undeclared conflict of interest prompted much re-examination of the supposed link with autism. The hardened believers didn't change their minds, and never will, but a glimmer of rationality flickered through the clouds of suspicion. MMR inoculation rates were rising again. And then came the five-in-one injection, and rumours of compulsory …