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Why is myocarditis more prevalent after the second mRNA vaccine dosage?

https://www.cdc.gov/coronavirus/2019-ncov/vaccines/safety/my...

If this was merely application error, ought we expect this reaction to be equally probable after the first and second dosages, this isn't what the data suggests.

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Why would the level of reaction from tissue exposed to a higher than intended dose of a novel protein be the same as its reaction to a higher dose of a protein it has been primed to react to?

myocarditis isn't instant, and while it typically presents within a week, given that there is a long tail, you would expect to see it more likely after the second dose. Furthermore, it could be that in some cases the first jab causes the myocarditis, but the second dose symptoms causes the myocarditis to become evident.

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