Medicines and Healthcare products Regulatory Agency (MHRA) found 79 cases and 19 deaths after 20 million doses. 79/20 million = 1 in 250,000. The risk is unmeasurably small
Arguably the risk is 4 in a million..... so not "unmeasurably"
It is a very specific blood clot, (CVT) that does occur in the general population, also there is a question over weather or not we are looking more into things because of covid, 80 year old doris who in 2021 had a stroke just a day or two after there covid vaccine, was investigated and found to die of a CVT, where as 80 year old Dorris who in 2018 died of a 'stroke' they didn't look to much into it, she was old and she had a stroke....
If a blood vessel is hit, it will draw in blood, which is obvious. It appears that some countries always aspirate, others not, and it can vary between those giving the vaccine.
https://www.youtube.com/watch?v=WuyAtvwP2H4&t=1127s
AZ vaccine is safe if injected properly, so don't worry, just ask them to aspirate. Just typing this having returned from my second dose of AZ. I'm fine so far, but its only been 20 minutes.
When I went for mine, the women who did it "volunteers" where best described as 'dinner-lady-esque' and prodded my arm like they where trying to decide it if was ripe enough, I don't think they drew back, thinking about it, I was just happy that they managed to find the correct muscle and didn't hit the bone.
Realistically there is always a risk of hitting a blood vessel, but in 20 million+ jabs the likelihood of hitting a blood vessel is probably considerably more likely to have occurred than the 4 in a million instances of CVT blood clots that have been recorded.
Something like 24,000 people are struck by lightning every year in the UK?
Much more likely to be killed in a car accident, or hit by a bus?
Some of the issues with the Astra Zeneca vaccine are definitely political. When the EU roll out was going badly and they had issues with the UK roll out and the who Export/import of vaccines, certain people where looking to cast a shadow over the AZ vaccine as it was the "British" vaccine, and what they achieved was casing doubt over there own vaccine program once AZ supplies where shored up