THE IMMUNITY conferred from the Covid vaccines tends to wane over the course of six months. As a result, people in the UK are being urged to take up the booster shot to give their immune systems a boost ahead of winter. Health authorities continue to monitor the side effects induced by the latest round of vaccinations. According to the Centres for Disease Control and Prevention , a “severe” side effect has been documented in people receiving either the Moderna or Pfizer vaccine, although it remains vanishingly rare.
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