COVID ‐19 Vaccination Is Not Associated With the Development of Idiopathic Inflammatory Myositis in US Veterans
Authors' conclusion
This comparison did not identify a risk for developing IIM after COVID-19 vaccination.
Study context
- Population
- US veterans enrolled in the Veterans Health Administration
- Participants
- 89 vs 445
- Comparison
- Prior COVID-19 vaccination in new-onset idiopathic inflammatory myositis (IIM) cases vs matched controls without IIM
- Casen = 89
- Controlsn = 445reference
- Outcome
- First COVID-19 vaccination before the index date
Methodological detailsmatched 1:5, chart review confirming incident IIM
- Matched 1:5
- Chart review confirming incident IIM
Main finding
As reported in the abstract
First COVID-19 vaccination within 30 days before the index date
Odds ratio
1.22
P = 0.643
Case
Adjusted odds ratio
1.12
P = 0.657
Case
Observational data: associations, not effects.
Further findings
First COVID-19 vaccination within 90 days of the index date
OR 0.78 · P = 0.479
| Outcome | aOR | P value |
|---|---|---|
| First COVID-19 vaccination within 90 days of the index date | 0.74 | P = 0.402 |
Other comparisons
- Multiple other comparisons also failed to identify a statistically significant association between COVID-19 vaccination and IIM
Original publication
COVID ‐19 Vaccination Is Not Associated With the Development of Idiopathic Inflammatory Myositis in US Veterans. Arthritis Care Res (Hoboken). Published 13 March 2026. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →