How many excess blood clot events per 100,000 vaccinations?

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11 Excess Blood Clot Events Per 100,000 Vaccinations Identified in Study

A study conducted in Denmark and Norway found an increase in blood clot events following the first dose of the AstraZeneca Covid-19 vaccine. Specifically, there were 11 excess blood clot events for every 100,000 vaccinations administered. This finding includes a rate of 2.5 cases of cerebral venous thrombosis, a rare type of brain blood clot, per 100,000 vaccinations.
Increased Rate of Venous Thromboembolic Events

The research, which analysed data from approximately 280,000 individuals aged 18-65 who received their first AstraZeneca vaccine dose between early February and March 11, identified 59 blood clots in veins. This figure was compared against an expected rate of 30 such events in the general population, indicating the excess of 11 events per 100,000 vaccinations.
Rare Brain Blood Clots Noted

Among the identified blood clot events, a higher-than-expected rate of cerebral venous thrombosis was observed. This specific type of rare brain blood clot occurred at a rate of 2.5 cases per 100,000 vaccinations, contributing to the overall increased risk.
Contextualisation of Absolute Risks

Researchers emphasised that the absolute risks associated with these venous thromboembolic events are small. They highlighted that these findings should be interpreted within the broader context of the benefits of Covid-19 vaccination, both for individuals and society as a whole.
Vaccine Rollout in Denmark and Norway

Both Denmark and Norway have suspended or withdrawn the use of the AstraZeneca vaccine. Norway halted its rollout on March 11 due to a small number of cases involving blood clots, bleeding, and low platelet counts, while Denmark has also removed the shot from its vaccination programme.

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How many excess blood clot events per 100,000 vaccinations?

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