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Clinical Course, Outcomes, and Risk Factors of Myocarditis and Pericarditis Following Administration of mRNA-1273

Laura C Zwiers1,2, Diederick E Grobbee1,2, Rob Schneijdenberg2

  • 1Julius Global Health, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, 3584 CX Utrecht, The Netherlands.

Vaccines
|July 30, 2025
PubMed

Insights

This study investigates risk factors and clinical outcomes of myocarditis and pericarditis after mRNA-1273 COVID-19 vaccination. It uses European healthcare data to assess vaccine-related risks and long-term health effects.

Area of Science:

  • Cardiology
  • Vaccinology
  • Epidemiology

Background:

  • Myocarditis and pericarditis are known risks following mRNA-1273 COVID-19 vaccination, primarily after the second dose in young males.
  • Limited data exists on risk factors beyond age/sex and the long-term clinical trajectory of these conditions.
  • Understanding these aspects is crucial for vaccine safety monitoring.

Purpose of the Study:

  • To identify risk factors for myocarditis and pericarditis post-mRNA-1273 vaccination.
  • To characterize the clinical course of vaccine-associated and non-associated myocarditis/pericarditis.
  • To determine risk factors for severe outcomes, including cardiac complications and mortality.

Main Methods:

  • Utilizing routinely collected healthcare data from five sources across four European countries within the VAC4EU network.
  • Employing a federated approach with a common data model and protocol for analysis.
  • Using case-cohort and cohort study designs with logistic and Cox regression for risk factor and outcome analysis.

Main Results:

  • This section is a protocol description; specific results are pending study completion.
  • The methodology is designed to robustly assess risk factors and clinical courses.
  • Federated analysis across multiple European data sources ensures broad applicability.

Conclusions:

  • This protocol outlines an international collaborative study on mRNA-1273 vaccine-associated myocarditis and pericarditis.
  • The research aims to provide comprehensive insights into risk factors and clinical outcomes.
  • Findings will contribute to informed vaccine safety surveillance and public health strategies.
Keywords:
COVID-19 vaccinesmyocarditispericarditissafetyvaccination

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