Brussels [Belgium], November 11 (ANI/Sputnik): The EU drug regulator advised on Thursday listing blood clots in the brain as a rare side effect of AstraZeneca's COVID-19 after observing cases that were not linked to a low platelet count.

"Events of cerebrovascular venous and sinus thrombosis (CVST) without thrombocytopenia have been observed very rarely following vaccination with Vaxzevria," an update read.

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The European Medicines Agency said 458 cases of vaccinated people developing a stroke followed by a brain bleed were observed up to September 30. The majority of cases occurred within the first four weeks of vaccination. Some cases had a fatal outcome.

The agency said that CVST should be added to the product information as a side effect of "unknown frequency." Blood clots forming in the brain while the blood platelet count is low was listed as a "very rare" side effect of the vaccine in April. (ANI/Sputnik)

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