Advertisement UK regulators have restricted AstraZeneca's vaccine in under-30s because their risk of dying from Covid is so small and there are early signs young people are more prone to blood clots after the jab. Analysis of the 79 cases of the rare side spotted in the UK so far has suggests one in 90,000 adults aged 18 to 29 will likely suffer the clots compared to one in 500,000 over-60s. Scientists admit they do not have enough data to say for certain that the jab is causing the brain clots or whether these patients would have developed them regardless. They also don't know whether young people are actually more at risk because just 1.5million out of the 20m AstraZeneca jabs deployed so far were to under-30s, and most of them were already ill or vulnerable.