Question
Does the Oxford/AZ vaccine increase the risk of blood clots?
6 April 2021. Related: All topics, COVID-19.
Answer
The research on this question has been changing during March and April 2021. It relates to reports of very rare but serious blood clots in people who also had this vaccine.
Although the evidence for a link has slowly changed to support a very low risk, this is still being studied.
If the vaccine is the cause, the risk is much lower than 1 in 100,000 people.
Most cases were in women younger than 30 and UK guidelines continues to recommend general use. Women younger than 30 can use the alternative COVID vaccine from Pfizer.
This question was updated in April from an original post on 15 Match 2021.
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