The Big Catch-up is a global initiative launched in April 2023 to close immunization gaps caused by the backsliding of immunization coverage during the COVID-19 pandemic, restore global immunization levels, and strengthen immunization systems so that catch-up activities become an integral part of immunization programmes.
Building on the Big Catch-up FAQs, this document summarizes key information for countries at each stage of developing their Big Catch-up plans and activities:
1. Understanding the Big Catch-up
2. Developing an application
3. Application review process
4. Activity implementation
5. Monitoring catch-up activities
This document will be updated as needed. Please check back to ensure you are viewing the most recent version.
Last update: 7 March 2024
Catch-up guidance and tools
This resource appears in the following Hot Topic page:
The resource is included in the following table:
| Title | Author | Year | Type | Language |
|---|
| Administering Catch-Up Vaccinations | Immunization Academy | 2022 | Training | English, French |
| Big Catch-up : Case Study Guidance and Sample Tools for Monitoring and Learning | IA2030 Partnership | 2024 | Tool | English, French |
| Big Catch-Up (BCU) The Real-Time Monitoring (RTM) Readiness Checklist | UNICEF | 2025 | Tool | English |
| Big Catch-Up Frequently Asked Questions (FAQs) | World Health Organization (WHO), UNICEF, Gavi, the Vaccine Alliance | 2024 | Guidance | English, French |
| Big Catch-up Information Pack for Regional and Country Teams | World Health Organization (WHO), UNICEF, Gavi, the Vaccine Alliance | 2024 | Guidance | English, French |
| Catch-Up Institutionalization Assessment Tool | IA2030 Partnership | 2025 | Tool | English |
| How to Record and Report Catch-Up Vaccinations | Immunization Academy | 2022 | Training | English, French |
| Leave no one behind: guidance for planning and implementing catch-up vaccination | World Health Organization (WHO) | 2020 | Guidance | English, Portuguese, French |
| Managing Multiple Injections | Immunization Academy | 2022 | Training | English, French |
| Monitoring and reporting of essential immunization catch-up in the context of the Big Catch-Up | IA2030 Partnership | 2024 | Guidance | Arabic, English, Portuguese, French |
| Rapid Convenience Monitoring - Monitoring un- and under-immunized communities - August 2026 Update | World Health Organization (WHO) | 2025 | Guidance | English |
