Professor David Walker, Deputy Chief Medical Officer, told Daybreak that the launch of the mass immunisation scheme was purely coincidence that it came at the same time as the MMR scare.
He said: "The timing is simply this is the time it's taken to develop the vaccine and to develop it's implementation."
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The former Ukip leader has torn into the Labour leader as he backed his successor Paul Nuttall to claim the vacant Stoke Central seat.
The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.