Enhancing MMR vaccination surveillance in England: Comparing and contrasting new individual-level and existing aggregate data sources

Inclusive of its missing vaccine records, IIS will join COVER and ImmForm as a concordant source of MMR vaccination statistics for UKHSA surveillance. Other national and local users should assess whether differences in data source scope, as well as inter-regional and inter-source data discrepancies, impact their use. The continued availability of all sources provides the UKHSA with surveillance flexibility and permits previously impossible cross-validation.