COVID-19 Vaccinations, SARS-CoV-2 Infections, and Type 1 Diabetes in Finnish Children
Main finding · Risk of T1D associated with preceding COVID-19 vaccinationsResult — go to the resultHazard ratio 1.30 95% CI 0.97–1.72Authors' conclusion
There was no significant association between SARS-CoV-2 vaccination and risk of type 1 diabetes. Neither COVID-19 vaccinations nor SARS-CoV-2 infections explain the more severe symptoms at type 1 diabetes diagnosis observed in Finnish children after the beginning of the COVID-19 pandemic.
Study context
- Population
- Every Finnish child aged 5–14 years diagnosed with T1D during a 16-month period (September 2021 to December 2022); vaccinations from the National Vaccination Register; SARS-CoV-2 infections by antibody titer soon after diagnosis433 cases, 3 controls each
- Comparison
- COVID-19 vaccination vs no vaccination
- Casen = 433
- Outcome
- Risk of T1D associated with SARS-CoV-2 vaccination
Methodological detailsnationwide, matched for age, sex, and municipality, 3 controls per case
- Nationwide
- Matched for age, sex, and municipality
- 3 controls per case
Main finding
As reported in the abstract
Risk of T1D associated with preceding COVID-19 vaccinations
Hazard ratio
1.30
95% CI 0.97–1.72
P = 0.076
COVID-19 vaccinationvs no vaccination
HR 1.30 (95% CI 0.97–1.72); P = 0.076
Observational data: associations, not effects.
Further findings
Severity of symptoms at T1D diagnosis
- Vaccinations were linked to less severe symptoms at diagnosis
Protective HLA genotypes among case subjects
- Protective HLA genotypes more common among vaccinated vs unvaccinated case subjects
Insulin autoantibody positivity · at diagnosis
- Vaccinations inversely associated with insulin autoantibody positivity
SARS-CoV-2 infection and T1D symptoms or autoantibodies · at diagnosis
- No association between SARS-CoV-2 and T1D symptoms or autoantibodies at diagnosis
Original publication
COVID-19 Vaccinations, SARS-CoV-2 Infections, and Type 1 Diabetes in Finnish Children. Diabetes Care. Published 5 May 2026. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →