The Immune System

Why Some People Don't Experience Vaccine Side-effects, And Why It's Not A Problem

Most vaccines have side-effects and COVID vaccines are no different. The public are being reassured that if they experience a sore arm where the needle went in, or tiredness, a headache, fever or nausea, these are merely signs that the immune system is working as it should. This has left some people wondering: if that’s the immune system doing what it’s supposed to do, does a lack of side-effects mean my immune system hasn’t been primed to protect me?

Rest assured, it means no such thing. The vaccine clinical trials conducted by Pfizer show that 50% of the participants did not experience significant side-effects during the trial, yet 90% of the participants developed immunity against the virus. And the advice on the Moderna vaccine says that common side-effects may be experienced by one in ten people, yet the vaccine protects 95% of those who take it.

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