| 25(OH)D | 25-hydroxyvitamin D |
| ART | Antiretroviral therapy |
| BFHI | Baby Friendly Hospital Initiative |
| CDC | Centers for Disease Control and Prevention |
| COVID-19 | Coronavirus disease 2019 |
| HIV | Immunodeficiency virus |
| Ig | Immunoglobulin |
| MIS-C | Multisystem inflammatory syndrome in children |
| NICE | National Institute for Health and Care Excellence |
| OR | Odds ratio |
| RCT | Randomized controlled trial |
| RSV | Respiratory syncytial virus |
| RT-PCR | Reverse transcriptase-polymerase chain reaction |
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