To assess vaccination uptake rates in children aged ≤5 years, researchers analyzed longitudinal data at general practice level for England captured in the COVER programme. They found the absolute inequality in vaccine uptake at baseline (2019-2020) was largest for MMR2 in children at age 5 years. For all faccinations studied, the SII for uptake increased over the study period, and the number of children susceptible to measles increased 15-fold in the least deprived group.