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The most common side effects of the Covid-19 vaccines are pain or tenderness at the injection site – in other words, a sore arm – a UK study has suggested.

Roughly one in four people had wider effects like fever, headache, nausea and fatigue.

But these only lasted on average for one day.

Researchers involved in the ZOE Covid Symptom Study app saw fewer reactions than were seen in clinical trials.

Confidence in the vaccines has continued to grow since the end of last year, with more than 80% saying they believe the vaccines are

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