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No, vaccine side effects don't tell you how well your immune system will protect you from COVID-19

  • Written by Robert Finberg, Professor of Medicine, University of Massachusetts Medical School
No, vaccine side effects don't tell you how well your immune system will protect you from COVID-19It's not a bad sign if you feel fine after your COVID-19 shot.Luis Alvarez/DigitalVision via Getty Images

If someone gets a headache or feels a bit under the weather after receiving a COVID-19 vaccine, it’s become common to hear them say something like “Oh, it just means my immune system is really working hard.” On the flip side,...

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