According to AstraZeneca, there was a vaccine trial for volunteers around the same time I had mine? When I got there I had not been told what I was going to be given. I had not agreed to a trial either.
[See https://www.ox.ac.uk/news/2020-05-22-oxford-covid-19-vaccine-begin-phase-iiiii-human-trials]
I don’t want to volunteer for a third unknown injection and I don’t want more saline without professional consolutation on the short and long term effects and if there is something I should do before having it. I.e. Have an abnormally low salt intake for a few days or something. Like just drink water for 48 hours or something.