| AEFI | Adverse Event Following Immunization |
| AESI | Adverse Event of Special Interest |
| CI | Confidence Interval |
| GBS | Guillain–Barré syndrome |
| ICU | Intensive care unit |
| IQR | Interquartile range |
| NVV | Non-virus-vectored (adenoviral vector–based) COVID-19 vaccines |
| PAC-VR | Pharmacovigilance Autonomic Center of the Valencia Region |
| PCR | Polymerase Chain Reaction |
| RR | Relative Risk |
| VID | Integrated Database of the Valencian Health System |
| VIS | Vaccine Information System |