https://www.cdc.gov/vaccines/acip/meetings/downloads/slides-2023-09-12/07-COVID-Klein-508.pdf 

Important update on myocarditis from Covid mRNA vaccines for people age 12-39 who received bivalent boosters:
only 2 cases among over 550,000 people dosed

https://media.mstdn.social/media_attachments/files/111/059/288/934/150/218/original/6741cd06a99554b5.png