DoubleChecks

What was claimed

Myocarditis after Covid vaccine: 5 per million. Myocarditis after Covid infection: 150 per million

Our verdict

Needs caution

Multiple peer-reviewed studies document rates of 213-450 per million depending on age and sex, with young males at 450 per million. The 150 per million figure significantly underestimates the actual risk by roughly 50-67%. One source cites 146 cases per 100,000 after infection, which equals 1,460 per million, not 150 per million. Other sources show infection risk is higher than vaccine risk, but the exact 150 per million figure is not consistently supported across the provided evidence. (Only 2 of 3 AI systems responded.)

Combined assessment21 sourcesChecked Sep 6, 2026

Why this verdict

  • Myocarditis after Covid infection: 150 per million

    Misleading
    Two assessments reached this conclusion; one differed·Claude: Verified

  • Myocarditis after Covid infection: 150 per million

    Can’t verify
    One assessment reached this conclusion

Evidence reviewed

21 sources

Perplexity and Claude sources are combined here.

pmc.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govcidrap.umn.edunature.combmj.compmc.ncbi.nlm.nih.govacc.orgpmc.ncbi.nlm.nih.govfda.govahajournals.org

Individual assessments

Assessment summary

  • The vaccine figure is in the right general range, but the infection figure is not a robust universal estimate and depends heavily on study design, age, and outcome window.
  • Current sources show myocarditis after infection is clearly higher than after vaccination, but the specific pair of numbers given is oversimplified and partly misleading.

Claims reviewed

Myocarditis after Covid vaccine: 5 per million

Misleading
Recent reviews and surveillance estimates place vaccine-associated myocarditis around 2–6 per million for many populations, and some current CDC-linked estimates are about 5 per million in 2023-24 formulations. But risk is much higher in young males after dose 2, so a single universal rate is misleading.

This claim may mislead readers without added context.

Myocarditis after Covid infection: 150 per million

Can’t verify
One source cites 146 cases per 100,000 after infection, which equals 1,460 per million, not 150 per million. Other sources show infection risk is higher than vaccine risk, but the exact 150 per million figure is not consistently supported across the provided evidence.

Assessment summary

  • The vaccine rate of 5 per million is approximately accurate as a general average.
  • However, the infection rate of 150 per million significantly underestimates documented rates of 213-450 per million depending on age and sex.
  • The comparison correctly shows infection poses higher risk, but the infection figure is misleadingly low.

Claims reviewed

Myocarditis after Covid infection: 150 per million

Misleading
Multiple peer-reviewed studies document rates of 213-450 per million depending on age and sex, with young males at 450 per million. The 150 per million figure significantly underestimates the actual risk by roughly 50-67%.

This claim may mislead readers without added context.

Myocarditis after Covid vaccine: 5 per million

Verified
Research shows overall rates around 5.98 per million doses across all populations, though rates vary by age group (12.6 per million for ages 12-39 after second dose). The 5 per million figure is a reasonable approximation.
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