| HCWs | Healthcare workers |
| MDs | Medical doctors |
| MS | Medical specialists |
| WHO | World Health Organization |
| VPDs | Vaccine-preventable diseases |
| CRS | Congenital rubella syndrome |
| ELISA | Enzyme-linked immunosorbent assay |
| RHIs | Regional health inspectorates |
| IgG | Immunoglobulin G |
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