Epidemiology of myocarditis and pericarditis following mRNA vaccination by vaccine product, schedule, and interdose interval among adolescents and adults in Ontario, Canada

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dc.contributor.author

Buchan, Sarah A.

Seo, Chi Yon

Johnson, Caitlin

Alley, Sarah

Kwong, Jeffrey C.

Nasreen, Sharifa

Calzavara, Andrew

Lu, Diane

Harris, Tara M.

Yu, Kelly

Wilson, Sarah E.

dc.date.accessioned

2025-01-27T16:03:41Z

dc.date.available

2025-01-27T16:03:41Z

dc.date.issued

2022-06-24

dc.description.abstract - en

<p>Importance Increased rates of myocarditis or pericarditis following receipt of COVID-19 mRNA vaccines have been observed. However, few available data are associated with differences in rates of myocarditis or pericarditis specific to vaccine products, which may have important implications for vaccination programs.</p> <p>Objective To estimate rates of reported myocarditis or pericarditis following receipt of a COVID-19 mRNA vaccine by product, age, sex, dose number, and interdose interval.</p> <p>Design, Setting, and Participants This population-based cohort study was conducted in Ontario, Canada (population: 14.7 million) from December 2020 to September 2021 and used data from Ontario’s COVID-19 vaccine registry and passive vaccine-safety surveillance system. All individuals in Ontario, Canada, who received at least 1 dose of COVID-19 mRNA vaccine between December 14, 2020, and September 4, 2021, and had a reported episode of myocarditis or pericarditis following receipt of the COVID-19 vaccine during this period were included. We obtained information on all vaccine doses administered in the province to calculate reported rates of myocarditis or pericarditis.</p> <p>Exposures Receipt of a COVID-19 mRNA vaccine (mRNA-1273 [Moderna Spikevax] or BNT162b2 [Pfizer-BioNTech Comirnaty]).</p> <p>Main Outcomes and Measures All reports of myocarditis or pericarditis meeting levels 1 to 3 of the Brighton Collaboration case definitions were included. Rates and 95% CIs of reported cases of myocarditis or pericarditis per 1 000 000 mRNA vaccine doses administered were calculated by age, sex, dose number, vaccine product, and interdose interval.</p> <p>Results Among 19 740 741 doses of mRNA vaccines administered, there were 297 reports of myocarditis or pericarditis meeting the inclusion criteria; 228 (76.8%) occurred in male individuals, and the median age of individuals with a reported event was 24 years (range, 12-81 years). Of the reported cases, 207 (69.7%) occurred following the second dose of the COVID-19 mRNA vaccine. When restricted to individuals who received their second dose during the period of enhanced passive surveillance (on or after June 1, 2021), the highest rate of myocarditis or pericarditis was observed in male individuals aged 18 to 24 years following mRNA-1273 as the second dose (299.5 cases per 1 000 000 doses; 95% CI, 171.2-486.4 cases per 1 000 000 doses); the rate following BNT162b2 as the second dose was 59.2 cases per 1 000 000 doses (95% CI, 19.2-138.1 cases per 1 000 000 doses). Overall rates for both vaccine products were significantly higher when the interdose interval was 30 or fewer days (BNT162b2: 52.1 cases per 1 000 000 doses [95% CI, 31.8-80.5 cases per 1 000 000 doses]; mRNA-1273: 83.9 cases per 1 000 000 doses [95% CI, 47.0-138.4 cases per 1 000 000 doses]) compared with 56 or more days (BNT162b2: 9.6 cases per 1 000 000 doses [95% CI, 6.5-13.6 cases per 1 000 000 doses]; mRNA-1273: 16.2 cases per 1 000 000 doses [95% CI, 10.2-24.6 cases per 1 000 000 doses]).</p> <p>Conclusions and Relevance The findings of this population-based cohort study of Ontario adolescents and adults with myocarditis or pericarditis following mRNA COVID-19 vaccination suggest that vaccine products and interdose intervals, in addition to age and sex, may be associated with the risk of myocarditis or pericarditis after receipt of these vaccines. Vaccination program strategies, such as age-based product considerations and longer interdose intervals, may reduce the risk of myocarditis or pericarditis following receipt of mRNA vaccines.</p>

dc.description.sponsorship

This work was supported by Public Health Ontario. This work was also supported by the Canadian Immunization Research Network through grant CNF 151944 from the Public Health Agency of Canada and the Canadian Institutes of Health Research. In addition, this work was supported by ICES, which is funded by an annual grant from the Ontario Ministry of Health.

dc.identifier.doi

https://doi.org/10.1001/jamanetworkopen.2022.18505

dc.identifier.issn

2574-3805

dc.identifier.pubmedID

35749115

dc.identifier.uri

https://open-science.canada.ca/handle/123456789/3359

dc.language.iso

en

dc.publisher - en

American Medical Association

dc.publisher - fr

American Medical Association

dc.rights - en

Creative Commons Attribution 4.0 International (CC BY 4.0)

dc.rights - fr

Creative Commons Attribution 4.0 International (CC BY 4.0)

dc.rights.uri - en

https://creativecommons.org/licenses/by/4.0/

dc.rights.uri - fr

https://creativecommons.org/licenses/by/4.0/deed.fr

dc.subject - en

Health

Epidemiology

Immunization

Coronavirus diseases

dc.subject - fr

Santé

Épidémiologie

Immunisation

Maladie à coronavirus

dc.subject.en - en

Health

Epidemiology

Immunization

Coronavirus diseases

dc.subject.fr - fr

Santé

Épidémiologie

Immunisation

Maladie à coronavirus

dc.title - en

Epidemiology of myocarditis and pericarditis following mRNA vaccination by vaccine product, schedule, and interdose interval among adolescents and adults in Ontario, Canada

dc.type - en

Article

dc.type - fr

Article

local.acceptedmanuscript.articlenum

e2218505

local.article.journalissue

6

local.article.journaltitle - en

JAMA Network Open

local.article.journalvolume

5

local.pagination

1-12

local.peerreview - en

Yes

local.peerreview - fr

Oui

local.requestdoi - en

No

local.requestdoi - fr

No

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