These reactions to the vaccine are very rare, and anaphylaxis affects people who receive a COVID-19 vaccine.
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I took my temperature, and found I was running a fever.
If longer, seek immediate medical treatment.
Call your doctor if redness or tenderness in the arm increases after a day or if side effects don't go away after a few days, the CDC says.
Doing so does not prevent side effects, which is dependent on each body's response to the vaccine, says Dr Lee.