| ALRTI | Acute Lower Respiratory Tract Infection |
| AMED | Japan Agency for Medical Research and Development |
| ANOVA | Analysis of Variance |
| CI | Confidence Interval |
| COVID-19 | Coronavirus Disease 2019 |
| ELISA | Enzyme-Linked Immunosorbent Assay |
| FcRn | Neonatal Fc Receptor |
| GMT | Geometric Mean Titer |
| IgG | Immunoglobulin G |
| IQR | Interquartile Range |
| NPI | Non-Pharmaceutical Intervention |
| RSV | Respiratory Syncytial Virus |
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