Blood Clotting After Vax Explained

Patients developed blood clotting conditions after receiving the AstraZeneca COVID-19 vaccine at a "similar" rate to those who received the Pfizer/BioNTech jab, say researchers, according to a report from Euronews.

Photo Insert: Formation of a blood clot

A team of researchers from Spain, the UK and the Netherlands compared data from over 1.3 million people vaccinated against COVID in Catalonia, looking for evidence of blood clotting conditions that developed after they received their vaccinations.

"In this study including 1,372,213 people vaccinated against SARS-CoV-2, similar safety profiles were seen for both vaccines," the researchers wrote in their pre-print paper, which has not been peer-reviewed.

Crucially, the study authors found that people who had been infected with COVID-19 developed blood clots at a far higher rate than those who had received either of the AstraZeneca or Pfizer/BioNTech vaccines.

The early-stage findings come after a challenging period for the AstraZeneca vaccine. In April The European Medicines Agency (EMA) said there was a "possible link" between the vaccine and "very rare cases of unusual blood clots with low blood platelets".

Following the discovery, many countries around the world imposed restrictions on its use.

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