Here is part of your question answered: The lates
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The latest study enrolled 2,247 U.S. kids ages 12 to 17 last summer and found the two-dose vaccine was 80% effective at preventing symptomatic COVID-19 infection
https://www.modernhealthcare.com/supply-chain...s-young-12
What they have found in the MRna vaccines is that 12-17 is 7 times more likely to experience myocarditis and end up with severe issues from getting covid and from 5-12 the MRna vaccines is only 11% effective so more likely to experience adverse reactions to vaccine than it help them