The UK medicines regulator, the MHRA, has concluded there is a possible link between the Oxford/AstraZeneca Covid vaccine and extremely rare blood clots but says that more research is still needed.

The risk of the rare side effect of blood clots after vaccination remains extremely small.

To date and overall, just over 10 people develop this condition for every million doses of AZ vaccine given.

For people aged 40 or over and those with other health conditions, the benefits of being vaccinated with the Oxford/AstraZeneca vaccine outweigh any risk of clotting problems.

This content has been reviewed by clinicians and public health professionals Page last reviewed: 23 April, 2021