| BCU | big catch-up |
| EPI | Essential Programme on Immunization, previously called Expanded Programme on Immunization |
| GAVI | Global Alliance Vaccine Initiative |
| GPEI | Global Polio Eradication Initiative |
| IA2030 | Immunization Agenda 2030 |
| RI | routine immunization |
| ZD | zero dose |
| UI | under-immunized |
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