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.)

All 2 AI systems agree20 sources citedChecked Sep 6, 2026

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Key findings

Myocarditis after Covid infection: 150 per million

Misleading95%
1 AI checked

Myocarditis after Covid infection: 150 per million

Can’t verify82%
1 of 3 AIs agree·Claude: Verified, Perplexity: Misleading

Verified against 20 sources

pmc.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govcidrap.umn.edunature.combmj.compmc.ncbi.nlm.nih.govacc.orgpmc.ncbi.nlm.nih.govfda.govahajournals.orgtheheartgroup.co.nzcdc.govthelancet.commed.stanford.edujamanetwork.compmc.ncbi.nlm.nih.govpmc.ncbi.nlm.nih.govacademic.oup.comgoodrx.compmc.ncbi.nlm.nih.gov

Detailed Analysis

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.

Why this verdict

  • 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 checked

Myocarditis after Covid vaccine: 5 per million

Misleading89%
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 verify82%
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.

What other AI think

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.

Why this verdict

  • 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 checked

Myocarditis after Covid infection: 150 per million

Misleading95%
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

Verified75%
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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