| COVID-19 | Coronavirus Disease 2019 |
| EMR | Eastern Mediterranean Region |
| GASTAT | General Authority for Statistics (Saudi Arabia) |
| GCC | Gulf Cooperation Council |
| GHO | Global Health Observatory (WHO) |
| MCV1 | First-dose measles-containing vaccine |
| MCV2 | Second-dose measles-containing vaccine |
| MoH | Ministry of Health (Saudi Arabia) |
| RD | Rate difference |
| RR | Rate ratio |
| WHO | World Health Organization |
| WUENIC | WHO/UNICEF Estimates of National Immunization Coverage |