Analysis of Myocarditis Among 252 Million mRNA-1273 Recipients Worldwide.

Abstract

BACKGROUND:

Growing evidence indicates a causal relationship between SARS-CoV-2 infection and myocarditis. Post-authorization safety data have also identified myocarditis as a rare safety event following mRNA COVID-19 vaccination, particularly among adolescent and young-adult males after dose 2. We further evaluated the potential risk by querying the Moderna global safety database for myocarditis/myopericarditis reports among mRNA-1273 recipients worldwide.

METHODS:

Myocarditis/myopericarditis reports from 18 December 2020 to 15 February 2022 were reviewed and classified. The reported rate after any known mRNA-1273 dose was calculated according to age and sex, then compared with a population-based incidence rate to calculate observed-to-expected rate ratios (RRs).

RESULTS:

During the study period, 3017 myocarditis/myopericarditis cases among 252 million mRNA-1273 recipients who received at least 1 dose were reported to the Moderna global safety database. The overall reporting rate was 9.23 per 100 000 person-years, which was similar to the expected reference rate (9.0 cases per 100 000 person-years; RR [95% confidence interval (CI)], 1.03 [.97-1.08]). When stratified by sex and age, observed rates were highest for males aged <40 years, particularly those 18-24 years (53.76 per 100 000 person-years), which was higher than expected (RR [95% CI], 3.10 [2.68-3.58]). When considering only cases occurring within 7 days of a known dose, the observed rate was highest for males aged 18-24 years after dose 2 (4.23 per 100 000 doses administered).

CONCLUSIONS:

Myocarditis/myopericarditis rates were not higher than expected for the overall population of mRNA-1273 recipients but were higher than expected in males aged 18-24 years, with most cases occurring 7 days after dose 2.

• Authors: Walter Straus, Veronica Urdaneta, Daina B Esposito, James A Mansi, Cesar Sanz Rodriguez, Paul Burton, José M Vega
• Journal: Clinical infectious diseases : an official publication of the Infectious Diseases Society of America (Clin Infect Dis) Vol. 76 Issue 3 Pg. e544-e552 (02 08 2023) ISSN: 1537-6591 [Electronic] United States
• PMID: 35666513 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © The Author(s) 2022. Published by Oxford University Press on behalf of Infectious Diseases Society of America.

Chemical References

• 2019-nCoV Vaccine mRNA-1273
• COVID-19 Vaccines

Topics

• Adolescent
• Adult
• Male
• Humans
• 2019-nCoV Vaccine mRNA-1273
• COVID-19
• COVID-19 Vaccines
• Myocarditis (epidemiology)
• SARS-CoV-2
• Vaccination