The Second Dose of a COVID-19 Vaccine: Side Effects, Why
Both the Pfizer-BioNTech and Moderna vaccines reported similar side effects, which don’t last long — about one to three days. The most common side effects include a sore arm, fatigue (feeling tired), headache, aches, and fever. Side effects are a good sign — they indicate that the vaccine is working by triggering the immune system. Severe side effects are rare and treatable.
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