S Ghebrehewet1, M Falconer, P McDonald
1Communicable Disease Unit, Countess of Chester Health Park, Cheshire & Merseyside Health Protection Team, Public Health Laboratory, Liverpool Road, Chester CH2 1UL. samuel.ghebrehewet@nwhpa.nhs.uk
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Many children received the measles, mumps, and rubella (MMR) vaccine but were not recorded in the Child Health Computer System (CHCS). This data validation study found corrected MMR vaccine uptake was 2.1% higher than initially reported.
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