[DannyTN]

Myocarditis associated with Influenza Virus B in Pediatric: A case report and literature review - 2017

So yes it's not unheard of.

[Still Thinking]

Ah OK. Thank you!

[9YearLurker]

Monstrously rare (too rare really to establish causation) and far, far more likely to have come from the jabs.