The UK health regulator has identified 30 cases of rare blood clot events in people who had recently been given the AstraZeneca coronavirus vaccine.
However, health officials have insisted it is still safe, with the risk associated with this type of blood clot ‘very small’ and the benefits of the vaccines against Covid-19 continuing ‘to outweigh any risks’.
The Medicines and Healthcare Regulatory Agency (MHRA) revealed the latest figures last night.
It said there had been 30 reports up to and including March 24 – that is 25 more than were announced earlier this month.
Of those, 22 were of the extremely rare cerebral venous sinus thrombosis, and 8 were of other clotting events associated with low blood platelets.
That number is out of a total of 18.1 million doses administered in the UK, a rate of around one in 600,000.
The MHRA said there were no reports among people given the Pfizer/BioNTech vaccine.
Fears over the safety of the jab led some countries to restrict use of the AstraZeneca vaccine while others have resumed inoculations, as investigations into reports of rare, and sometimes severe, blood clots continue.
The MHRA said: ‘Our rigorous review into the UK reports of a rare and specific type of blood clot is ongoing.
‘Up to and including 24 March, we have received 22 reports of cerebral venous sinus thrombosis (CVST) and 8 reports of other thrombosis events with low platelets, out of a total of 18.1 million doses of COVID-19 Vaccine AstraZeneca given by that date. There were no reports for the Pfizer/BioNTech vaccine.
‘On the basis of this ongoing review, the benefits of the vaccines against COVID-19 continue to outweigh any risks and you should continue to get your vaccine when invited to do so.’
There is still no proof the vaccines are behind the blood clot events and the link between the two, if any, is still unclear.
Experts in some countries have suggested the condition is most common among women. However, every case in the UK so far has been in males.
Moreover, the frequency of cases does not appear to increase in proportion as more vaccines are rolled out.
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