Missed opportunities for vaccination (MOV) in children up to 5 years old in 19 Médecins Sans Frontières-supported health facilities: a cross-sectional survey in six low-resource countries.

Avoiding MOV should remain a priority in low-resource settings, in line with the new 'Immunization Agenda 2030'. Children beyond their second year of life are particularly vulnerable for MOV. We strongly recommend assessment of eligibility for vaccination as routine healthcare practice regardless of the reason for the visit by screening vaccination card. Strengthening implementation of 'Second year of life' visits and catch-up activities are proposed strategies to reduce MOV.