The abstract is read at the publisher; the summary is JClub's.
COVID-19 vaccination is linked to a higher incidence of incident SIRVA than influenza vaccination in adults, with 1.84 vs 1.15 cases per 10,000 vaccinations.
- Why it matters: Evidence on SIRVA risk after COVID-19 vaccination has been limited, creating uncertainty for clinicians and patients comparing it with influenza vaccination.
- What they did: In a population-based cohort at Kaiser Permanente Southern California (ages ≥18; Aug 1, 2023–Apr 30, 2024), researchers used a validated natural language processing algorithm to identify SIRVA and estimated adjusted relative risks via robust Poisson regression with inverse probability of treatment weighting.
- The result: Among 1,830,636 vaccinations, 252 SIRVA cases occurred (110 after 596,614 COVID-19; 142 after 1,234,022 influenza), yielding an adjusted RR of 1.63 (95% CI, 1.16–2.28) and an adjusted absolute increase of 0.67 per 10,000; in adults ≥65, risk did not differ significantly between COVID-19 and high-dose influenza (adjusted RR, 1.41; 95% CI, 0.92–2.15).
The findingWhy it mattersWhat they didThe result
AI summary of the abstract · may contain errors · not medical advice · read the paper.