The discovery of the rare side effects was an important step in understanding how the vaccines affected the human body-and something that researchers said could make them safer in the future.īut this might not have happened had researchers short-circuited the scientific process and listened to physicist David Robert Grimes. "You could never have predicted it would have happened and the chances are vanishingly small, so we need to remember the bigger picture of the number of lives this vaccine has saved," said Prof Alan Parker of Cardiff University.ĪstraZeneca said the vaccine is thought to have saved more than a million lives around the world and prevented 50 million cases of Covid.Ī University of Oxford spokesperson said: "We continue to follow with interest any new developments and investigation into potential causes for these very rare side effects associated with the vaccine, whilst being reassured by real-world effectiveness data that the vaccine remains a highly effective tool for combating this pandemic." These clots, known as vaccine-induced immune thrombotic thrombocytopenia, have been linked to 73 deaths out of nearly 50 million doses of AstraZeneca given in the UK. A key vaccine component appears to attract a blood protein, which starts a chain reaction in the immune system that, in very rare occasions, can cause dangerous clots. Last week, the BBC and other media outlets reported that scientists had discovered the cause of rare side effects triggered by the AstraZeneca COVID-19 vaccine.
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