Leave No One Behind: Guidance for planning and implementing catch-up vaccination

Catch-up vaccination refers to the action of vaccinating an individual who, for whatever reason, is missing or has not received doses of vaccines for which they are eligible, per the national immunization schedule.

Catch-up vaccination can be conducted through regular routine immunization service delivery (fixed, outreach, mobile, school-based), periodic intensification of routine immunization (PIRI) activities, or through innovative local strategies that ensure individuals have the opportunity to receive routine immunizations for which they are overdue and eligible.