| IgG | Immunoglobulin G |
| ELISA | enzyme-linked immunosorbent assay |
| COVID-19 | coronavirus disease |
| CSF | cerebrospinal fluid |
| TMB | 3,3′,5,5′-tetramethylbenzidine |
| EPI | Expanded Program on Immunization |
| SIA | Supplementary Immunization Activity |
| MCV | measles-containing vaccine |
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