I too am concerned regarding this matter. My mother (91) and bedbound for nearly 3 years with Alzheimer's reacted very badly to her Oxford Astra Zeneca vaccination. She developed high fever and thus delirium - which as most of us realise is an assault on the brain. Things were so worrying I had to call paramedics out - mum was completely flat out barely conscious and talking non sense deliriously. This passed after 2 and a half days but took a lot longer to recover from and I believe has advanced her cognition further. I am therefore extremely worried regarding the second inoculation in the coming weeks. As a footnote I should report that mum had tested positive for Covid in November 2020 and did not develop any respiratory symptoms but was just very tired for about 2 weeks and I believe the dementia also moved on in this period, though I appreciate that could additionally be attributed to the isolation from others she had to undergo in this period. Sadly our beloved PA Lesley was the one who brought it in from visiting her family, and she tragically died from it 2 weeks later aged only 58. I had to self isolate upstairs and in the small conservatory, underwent 4 tests in this period and was seemingly OK. Social services were called into feed mum, and were pretty dreadful - but that's another story. Anyhow, given that mum may have had some existing anti bodies from her infection in November, perhaps that is why she had such a violent reaction to the first 'jab'. It leaves me extremely concerned and uncertain of what to do when the 2nd comes around in a few weeks - the GP 's were very determined and pressing that she should have it, and no doubt will be gain - but they do not live with the effects and the clear after effects. All comments help suggestions and advice extremely welcome. Thank you