AstraZeneca shot can cause rare blood clots but benefits outweigh risk, European
The committee said there had been 18 deaths reported in its review of 62 cases of CVST (a clotting in the sinuses that drain blood from the brain) and 24 cases of splanchnic vein thrombosis (in the abdomen) that were reported in an EU drug safety database. The cases came mainly from spontaneous reporting systems of the European Economic Area and the UK, where around 25 million people in total had received the vaccine, it noted.
The agency published its conclusion as the UK’s Medicines and Healthcare products Regulatory Agency held a press conference on the same issue, five days after its weekly report confirmed at least 22 people had experienced CVST and at least eight cases of thrombosis events with low blood platelet counts, which is a relatively rare combination.
EMA Executive Director Emer Cooke told a press conference Wednesday that the agency would add the clots and low platelet counts to its list of possible side effects from the vaccine, but added the safety committee “has confirmed that the benefits of the AstraZeneca vaccine in preventing Covid-19 overall outweigh the risks of side effects” and that that EMA’s recommendations for use of the vaccine were not changing.
EMA’s statement called on healthcare workers and people receiving the vaccine “to remain aware of the possibility of very rare cases of blood clots combined with low levels of blood platelets occurring within 2 weeks of vaccination.”
“So far, most of the cases reported have occurred in women under 60 years of age within 2 weeks of vaccination. Based on the currently available evidence, specific risk factors have not been confirmed,” the statement said, though Cooke said there was no clear risk profile found when the safety committee looked at age and gender of people reporting these rare adverse reactions.
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