| ESKD | End-stage kidney disease |
| DCI | Dialysis Clinic, Inc. |
| S/CO | Signal-to-cutoff ratio |
| CDC | Centers for Disease Control and Prevention |
| APR | Antibody positivity rate |
| COVID-19 | Coronavirus disease 2019 |
| RBD | Receptor binding domain |
| VOC | Variant of concern |
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