AI Article Synopsis

  • - This study explored the possible link between COVID-19 vaccinations and thyroid issues, particularly thyroiditis, using data from over 7.5 million adults and adolescents in Korea.
  • - Results indicated a slight increase in the risk of hypothyroidism exacerbation after vaccination, but not for other thyroid conditions like hyperthyroidism or thyroiditis in both adults and adolescents.
  • - Overall, the findings suggest that COVID-19 vaccinations are generally safe for thyroid health, with the exception of a noted risk for worsening hypothyroidism.

Article Abstract

Context: Emerging reports have raised concerns regarding the potential link between COVID-19 vaccination and thyroid dysfunction, specifically thyroiditis.

Objective: This study aimed to investigate the potential association between COVID-19 vaccination and the prevalence of thyroid diseases using data from a Korean national cohort.

Methods: This study included 7,579,210 adult and 241,063 adolescent vaccine recipients. A self-controlled case series design was applied to estimate the incidence rate ratio (IRR) of thyroid disease during the 55-day post-vaccination period (first and second dose) compared to the baseline period (non-exposure period) using conditional Poisson regression.

Results: In the adult population, IRRs for hyperthyroidism, hypothyroidism, subacute thyroiditis, and thyroid eye disease were 0.98 (95% CI 0.89-1.09), 0.91 (95% CI 0.84-0.98), 1.27 (95% CI 0.94-1.72), and 0.68 (95% CI 0.50-0.93) after the first vaccine dose and 0.96 (95% CI 0.87-1.06), 0.93 (95% CI 0.87-0.99), 1.32 (95% CI 0.96-1.80), and 1.06 (95% CI 0.81-1.38) after the second vaccine dose. While the risk of hyperthyroidism recurrence did not increase after vaccination, we observed an increased risk of hypothyroidism exacerbation. Subgroup analyses based on age, sex, and vaccine type revealed no significant differences in the incidence of thyroid diseases. In adolescents aged 12-17 years, no increase in the risk of thyroid disease was observed after vaccination.

Conclusions: This extensive national self-controlled case series analysis found an increased risk of exacerbation of hypothyroidism following COVID-19 vaccination. However, no significant association was observed between COVID-19 vaccination and an increased risk of most other thyroid diseases. These findings contribute to increasing evidence supporting the safety of COVID-19 vaccination in relation to thyroid health.

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Source
http://dx.doi.org/10.1210/clinem/dgae858DOI Listing

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