The UK medical regulator says that out of 30 people who suffered blood clots after receiving the Oxford-AstraZeneca vaccine, seven have died.
In total, only 30 people out of 18 million vaccinated with AstraZeneca by 24 March had these clots.
The Medicines and Healthcare Products Regulatory Agency says the benefits continue to outweigh any risk.
The data released by the MHRA on Friday showed 22 cases of cerebral venous sinus thrombosis (CVST) which is a type of blood clot in the brain.
These were accompanied by low levels of platelets, which help form blood clots, in the body. The MHRA also found other clotting problems alongside low platelet levels in eight people.
