Dr Lyons said that children who have not been fully immunised face a life-long risk of catching measles but said one dose of MMR would protect 90% of children very quickly and two doses protects 99%.
BBC: South West Wales
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Dr Lyons added that children who have not been fully immunised face a life-long risk of catching measles but said one dose of MMR would protect 90% of children very quickly and two doses protects 99%.