The EU’s medicines regulator says unusual blood clots should be listed as a very rare side effect of the AstraZeneca vaccine for Covid-19.
After a study into dozens of cases in the EU, the European Medicines Agency concluded the benefits of the vaccine outweighed the risk.
There was no definite causal link and though most cases were in women under 60, they also occurred in men.
It studied 86 blood clot cases. The EU has vaccinated over 20 million people.
The regulator said that one plausible explanation for the combination of blood clots and low blood platelets was an “immune response, leading to a condition similar to one seen sometimes in patients treated with heparin (heparin induced thrombocytopenia, HIT)”.