FACT CHECK
There is no evidence to suggest that the AstraZeneca vaccine causes blood clots
Earlier this week we looked into claims around the AstraZeneca vaccine. At the time of our fact check, 17 European nations, including France and Germany, had temporarily paused administering the AstraZeneca Covid vaccine, pending results of an investigation into blood clots from the European Medicines Agency.
Around 30 cases of “thromboembolic events” (meaning an issue relating to a blood clot blocking a blood vessel) had been reported in the five million people who had received the AstraZeneca vaccine in the European Economic Area.
Professor David Spiegelhalter, chair of the Winton Centre for Risk and Evidence Communication at Cambridge University calculated that, with a group of five million, you would expect to see 100 people a week develop blood clots, irrespective of any vaccine. This is significantly more than the 30 instances seen over a month following the AstraZeneca vaccine.
In clinical trials, where healthy people were given the vaccine, and a control group were given either a placebo or meningitis injection, there were slightly fewer serious adverse events in those who got the actual vaccine.
The UK’s regulator, the MHRA, said yesterday that the available evidence does not suggest that blood clots in veins are caused by COVID-19 Vaccine AstraZeneca.
Since we published our fact check, the European Medicines Agency has found the vaccine is “not associated” with a higher risk of clots, and many EU countries have now said they will resume using the vaccine.
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