COVID-19 vaccination and blood clotting

The UK vaccination programme has been very successful with more than 30 million people vaccinated and more than 6,000 lives already saved.

Recently there have been reports of a very rare condition involving blood clots and unusual bleeding after vaccination. This is being carefully reviewed but the risk factors for this condition are not yet clear.

Although this condition remains extremely rare there appears to be a higher risk in people shortly after the frst dose of the AstraZeneca (AZ) vaccine. Around 4 people develop this condition for every million doses of AZ vaccine doses given. This is seen slightly more often in younger people and tends to occur between 4 days and 2 weeks following vaccination.

This condition can also occur naturally, and clotting problems are a common complication of COVID-19 infection. An increased risk has not yet been seen after other COVID-19 vaccines but is being carefully monitored.

The following information leaflet provides further details about the COVID-19 vaccination and blood clotting.

Further information can be found on the NHS website: nhs.uk/CoronavirusVaccination