Cases of myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the outer lining of the heart) have been reported after BNT vaccination of children between 12 and 17 years of age. According to U.S. statistics, the risk of youths experiencing myocarditis after receiving the second BNT dose is 10 times higher than after the first dose, CNA reported.
The increased risk with a second dose is consistent with the mechanism of Antibody Dependent Enhancement.
Source:
https://www.taiwannews.com.tw/en/news/4340862.
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