| CVID | common variable immune deficiency |
| GMR | geometric mean rate |
| GMT | geometric mean antibody titers |
| HA | hemagglutinin |
| HI | hemagglutination inhibition assay |
| IVIG | Intravenous immunoglobulin |
| PID | primary immune deficiency |
| QIV | qudrivalent inactivated vaccine |
| aQIV | adjuvant qudrivalent inactivated vaccine |
| TIV | trivalent inactivated vaccine |
| aTIV | adjuvant trivalent inactivated vaccine |
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