https://twitter.com/ID_ethics/status/1437876328640876544
Better breakdowns by age and gender show a risk of myocarditis after two doses as high as 1 in 3000:
https://twitter.com/VPrasadMDMPH/status/1437067899089219589
This number has been steadily increasing, as time passes. Current consensus seems to be that one dose is the optimal tradeoff between risk and reward for young children.