- A study on 4928 students found that 17.1% had at least one cardiac symptom after the second dose of the BNT162b2 (Pfizer) vaccine. 1.03% had significant electrocardiogram (ECG) changes after vaccination, however, all symptoms improved during a 1 month follow-up. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9813456/ 30 comments science
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