The increased risk of being admitted to hospital or dying due to blood clots for someone with coronavirus is "much higher" than in people who had a first dose of vaccine, a study has found.
Researchers said their work is the first to compare the AstraZeneca and Pfizer vaccines with risks from Covid-19 on such a large scale.
This new research looked at more than 29 million people aged 16 or older who had a first dose of either vaccine in England between December and April.
Their findings suggest the risk of thrombocytopenia - a condition where the patient has a low count of cells, known as platelets, that help the blood clot - in someone with coronavirus is almost nine times higher than in someone who has had one dose of the AstraZeneca jab.