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1780 www. thelancet. com Vol 393 May 4, 2019 precisely targeted interventions—for example, by building upon existing research into the link between travel networks and coverage. 6 In The Lancet, Jonathan Mosser and colleagues7 report estimates of diphtheria-pertussis-tetanus (DPT) vaccine coverage across the African continent at highly localised scales. With use of large-scale public health data from 49 African countries between 2000 and 2016, the authors identified local heterogeneities in DPT coverage and dropout between the first (DPT1) and third (DPT3) doses of the programme. The authors highlighted regions with persistently low coverage and high vaccine dropout rates and assessed coverage with a focus on the 80% coverage target for administrative-level units set by the Global Vaccine Action Plan (GVAP). Although geospatial models have been used previously for subnational coverage …