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COVID-19 vaccination and blood clotting

Information about your vaccination

The UK vaccination programme has been very successful with more than 34 million people vaccinated and more than 10,000 lives already saved. The rapid rollout has meant that we have been able to protect more people and we are starting to lift the restrictions on our population. This leaflet is designed to help you make an informed decision about vaccination.

What is the concern?

Recently there have been reports of an extremely rare but serious condition involving blood clots and unusual bleeding after AstraZeneca (AZ) vaccination. Some people with this condition have suffered life changing effects and some have died. These cases are being carefully reviewed but the risk factors for developing this condition are not yet clear.

Although this condition remains extremely rare there is a higher risk in people after the first dose of the AZ vaccine. To date and overall, just over 10 people develop this condition for every million doses of AZ vaccine given across all ages. Cases are seen more often in younger people. First symptoms occur between 4 days and 4 weeks following vaccination.

Similar conditions can also occur naturally, and clotting problems are a common complication of COVID-19 infection. An increased risk of this condition has not been seen after other COVID-19 vaccines in the UK.