The agency has not specified the exact ages of the patients reporting symptoms, and the CDC’s vaccine safety group has not determined whether the condition is directly related to the vaccinations, and said the cases have been “mild” thus far. Patients have reported their symptoms within four days of receiving a vaccine dose. Follow-up cases are currently ongoing.
In April, Israel’s Health Ministry also announced it was looking into a handful of cases of heart inflammation, possibly linked to the Pfizer vaccine. The cases reported had been from people aged 30 or below.
https://www.msn.com/en-us/news/us/cdc-investigating-heart-problems-in-few-young-vaccine-recipients/ar-AAKhD8n