The MMR (measles, mumps and rubella) triple vaccine was introduced in the UK in 1988 for children aged 12 to 18 months.
Shortly after its introduction, the vaccine was implicated in the death of Glasgow baby Ryan Mason.
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Side-effect concerns about MMR vaccine date back to its introduction
Concerns about the adverse side-effects of the MMR vaccine have dogged it ever since it was introduced, according to the newly released files.
