In the 43,548-person Pfizer trial, side effects were short-term and mild to moderate: sore arm, fatigue, headache. Serious adverse events were low and similar in the vaccine and placebo groups.
Receipt
Redrawn from published values.
Polack FP, et al. Safety and Efficacy of the BNT162b2 mRNA Covid-19 Vaccine. N Engl J Med. 2020;383:2603-2615. doi:10.1056/NEJMoa2034577





