The Big Catch-Up: Immunization Recovery Frameworks in Punjab and Sindh

The Recovery Mission

The Big Catch-Up (BCU) initiative was deployed as an intensified operational recovery framework to systematically track and reclaim immunization coverage lost during pandemic disruptions, targeting zero-dose and under-immunized cohorts born between 2019 and 2022.

Operational Infrastructure

Managed under the leadership of the Federal Directorate of Immunization with technical guidance from the National Immunization Technical Advisory Group (NITAG), the strategy abandoned broad, generalized targets in favor of localized, data-driven 'adaptive management'.  Key structural elements include:

• The Cascade Training Model: A multi-tiered orientation model tracking down from federal to individual Union Councils, utilizing translated local-language toolkits and integrated microplanning workshops to establish high frontline consistency.
• The Mobilizer Network: House-to-house tracking squads composed of Lady Health Workers (LHWs) mapping community defaults and resolving vaccine hesitancy or cultural mobility restrictions through localized influencer engagement.
• Dual Reporting Verification: Tracking individual child longitudinal histories by expanding Electronic Medical Record (EMR) systems in Punjab and adjusting the Zindagi Mehfooz (ZM) platform application framework in Sindh to integrate extended 24-59 month age categories.

Documented Findings & Trends

Evaluative surveys highlight distinct performance patterns across target geographies. Punjab successfully achieved critical full immunization indicators through structural innovations like 'Clinic on Wheels' and flexible scheduling protocols. While campaign environments produced vital short-term coverage spikes, field leadership emphasizes that long-term fiscal and human resource sustainability requires catch-up mechanics to be fully embedded into routine immunization (RI) services rather than standalone campaigns.