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2 "Han Eol Jeong"
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Original article
Risk of new-onset seizures following immunization against COVID-19: a self-controlled case-series study
Hwa Yeon Ko, Dongwon Yoon, Ju Hwan Kim, Han Eol Jeong, Seung Bong Hong, Won Chul Shin, JU YOUNG SHIN
Epidemiol Health. 2025;e2025024.   Published online May 2, 2025
DOI: https://doi.org/10.4178/epih.e2025024    [Accepted]
  • 270 View
  • 15 Download
AbstractAbstract PDF
Abstract
OBJECTIVES
Despite emerging reports of new-onset seizures (NOS) following COVID-19 vaccination, safety evidence regarding the risk of NOS after vaccination remains limited. We aimed to investigate the potential association between NOS and COVID-19 vaccination.
METHODS
We conducted a self-controlled case series study utilizing a nationwide database linking the COVID-19 vaccination registry and the National Health Information Database (from February 2021 to October 2022). We identified adults (≥18 years) who received COVID-19 vaccination (BNT162b2, ChAdOx1 nCoV-19, mRNA-1273, NVX-CoV2373, or Ad26.COV2.S) and had a diagnosis of NOS accompanied by prescriptions of anti-seizure drugs. The observation period was defined as 240 days following vaccination. We evaluated the risk of NOS during a risk window of 28 days after vaccination compared to the control window (the remaining observation period excluding the risk window). Incidence rate ratios (IRRs) with 95% confidence intervals (CIs) were estimated using a conditional Poisson regression model.
RESULTS
Among 42,155,198 COVID-19 vaccine recipients, we identified 1,849 and 4,217 patients with NOS in the risk and control windows, respectively. There was no increased risk of NOS within the 28-day period following vaccination (IRR, 0.99; 95% CI, 0.94–1.05). Although results from subgroup analyses by vaccine type were largely consistent with the main findings (IRR, 0.95; 95% CI, 0.88–1.03 for BNT162b2; IRR, 0.95; 95% CI, 0.77–1.16 for ChAdOx1 nCoV-19; IRR, 1.58; 95% CI, 0.52–4.83 for Ad26.COV2.S), a marginally elevated risk was observed for mRNA-1273 (IRR, 1.21; 95% CI, 1.04–1.42).
CONCLUSIONS
There was no evidence of an increased risk of NOS following COVID-19 vaccination. These findings can be used as safety evidence in clinical decision-making and to bolster public confidence in COVID-19 vaccines. 
Summary
COVID-19: Original Article
Socioeconomic disparities in Korea by health insurance type during the COVID-19 pandemic: a nationwide study
Han Eol Jeong, Jongseong Lee, Hyun Joon Shin, Ju-Young Shin
Epidemiol Health. 2021;43:e2021007.   Published online January 13, 2021
DOI: https://doi.org/10.4178/epih.e2021007
  • 18,452 View
  • 437 Download
  • 15 Web of Science
  • 13 Crossref
AbstractAbstract AbstractSummary PDFSupplementary Material
Abstract
OBJECTIVES
This study explored socioeconomic disparities in Korea using health insurance type as a proxy during the ongoing coronavirus disease 2019 (COVID-19) pandemic.
METHODS
We conducted a retrospective cohort study using Korea’s nationwide healthcare database, which contained all individuals who received a diagnostic test for COVID-19 (n=232,390) as of May 15, 2020. We classified our cohort by health insurance type into beneficiaries of the National Health Insurance (NHI) or Medicaid programs. Our study outcomes were infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and COVID-19-related outcomes, a composite of all-cause death, intensive care unit admission, and mechanical ventilation use. We estimated age-, sex-, and Charlson comorbidity index score–adjusted odds ratios (aORs) with 95% confidence intervals (CIs) using a multivariable logistic regression analysis.
RESULTS
Of the 218,070 NHI and 14,320 Medicaid beneficiaries who received COVID-19 tests, 7,777 and 738 tested positive, respectively. The Medicaid beneficiaries were older (mean age, 57.5 vs. 47.8 years), more likely to be males (47.2 vs. 40.2%), and had a higher comorbidity burden (mean CCI, 2.0 vs. 1.7) than NHI beneficiaries. Compared to NHI beneficiaries, Medicaid beneficiaries had a 22% increased risk of SARS-CoV-2 infection (aOR, 1.22; 95% CI, 1.09 to 1.38), but had no significantly elevated risk of COVID-19-related outcomes (aOR 1.10, 95% CI 0.77 to 1.57); the individual events of the composite outcome yielded similar findings.
CONCLUSIONS
As socioeconomic factors, with health insurance as a proxy, could serve as determinants during the current pandemic, pre-emptive support is needed for high-risk groups to slow its spread.
Summary
Korean summary
사회경제적 수준과 코로나19 발생률 및 예후 간 연관성 등 코로나19로 인한 건강 불평등 현상은 아직 확인된 바가 없다. 건강보험 가입자 대비 의료급여 수급권자에서 SARS-CoV-2의 감염 위험이 더 높게 나타났다. 코로나19의 확산을 늦추기 위해서는, 의료급여 수급권자를 비롯한 취약계층 대상의 선제적 지원이 제공되어야 한다.
Key Message
Socioeconomic status, with health insurance as a proxy, could explain health inequalities in clinical outcomes, diverse disease incidence and prognosis, during the COVID-19 pandemic.

Citations

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