"I can give you a complete, categoric denial," said the Prime Minister's spokesman. "The story is wrong. Full stop. No equivocation. It's wrong." No10 acknowledged the medical evidence was under "continuous review". Officials also accepted parents had concerns over fears that the triple vaccine might, in some children, trigger autism and bowel disease. The spokesman added: "It is whether you play on those concerns or try to address them in a rational way. We have media hysteria. What we should address are the real questions. The questions are: Is MMR safe?