Blood Clots a Very Rare Side Effect of AstraZeneca Vaccine: EMA

The European Medicines Agency emphasizes that the benefits of the jab in protecting against COVID-19 still far outweigh the risks.

Written byCatherine Offord
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The European Medicines Agency has concluded that certain unusual types of blood clots are a very rare side effect of the Oxford/AstraZeneca COVID-19 vaccine, according to a statement the agency posted yesterday (April 7). These clots, which are associated with low blood platelet counts, have been reported in connection with a handful of deaths among the more than 34 million people who have received the vaccine in Europe and the UK, prompting several countries to alter their immunization rollouts in recent weeks.

Sabine Straus, chair of the committee that produced the EMA report, said at a press conference yesterday that the rate of cases appeared to be about 1 in 100,000 vaccinated people. According to the statement, the agency based its analysis on nearly 90 cases of blood clots, 18 of which were fatal. “The reported combination of blood clots and low blood platelets is very ...

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Meet the Author

  • After undergraduate research with spiders at the University of Oxford and graduate research with ants at Princeton University, Catherine left arthropods and academia to become a science journalist. She has worked in various guises at The Scientist since 2016. As Senior Editor, she wrote articles for the online and print publications, and edited the magazine’s Notebook, Careers, and Bio Business sections. She reports on subjects ranging from cellular and molecular biology to research misconduct and science policy. Find more of her work at her website.

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