A Timeline of COVID-19 Vaccine Side Effects
Oct 10, 2021 · The COVID vaccines are intramuscular , or "IM" for short. That means the liquid in the syringe goes directly into a muscle when the needle goes in. Your body's immune system sees this as a threat, and pain at the injection site is part of its response. That's why your arm may become sore, turn red, or swell a bit.
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