Missed opportunities for vaccination at point of care and their impact on coverage and urban–rural coverage inequity in the Gambia

Starting then stopping: a nationwide register-based study on the magnitude, predictors, and urban-rural patterns of under-vaccination variation across health centers in The Gambia

“…This definition is a modified version of the standard way of calculating dropout rates where a single later dose is compared with an earlier dose [ 3 ]. Our previous work has shown that a child can miss opportunities for simultaneous vaccination (MOSV) meaning that he/she can receive some but not all due doses in the same vaccination session [ 28 ]. Considering the possibility of MOSVs and our intention to ascertain whether a child came in contact with the vaccination system when their recommended 9 month doses were due, receipt of at least one of the doses recommended at 9 months is sufficient to prove a child had returned for vaccination.…”