Vaccine side effects are seen up to three times more often in people who have previously been infected with coronavirus, new figures show. The latest data from the King's College ZOE app, which has logged details from more than 700,000 vaccinations, found those with a prior infection were far more likely to report side effects than people who have not had the virus. The difference between the two was particularly pronounced among those who had been given the Pfizer jab. More severe side effects are often a sign of better immunity, and emerging research suggests just one dose of vaccine gives a similar protective effect to two doses in people who have had a previous infection. Experts have now started to question whether people with prior immunity from a natural infection need a second dose at all. The ZOE data shows that 12.2 per cent of people reported side effects after their first Pfizer jab, but that jumped to 35.7 per cent of those with a previous infection. For the Oxford/AstraZeneca jab, 31.9 per cent of people reported symptoms following their first vaccine, rising to 52.7 per cent of those who had previously been diagnosed with diagnosed with the virus. Most people reported muscle aches, feeling groggy or headaches.