> Now an international team, led by Flinders University, have found that in a small number of people, the immune system can accidentally confuse a normal adenovirus protein with a human blood protein termed platelet factor 4 (or PF4).
Seems to have been a legitimate, very rare, side effect
It's worth clarifying that the adenovirus-based (viral vector) vaccines that article is discussing were a completely different technology from the mRNA vaccines.
[−]atomicnumber3 · 2026-07-02 Thu 05:22 UTC ·
link
I am quite curious too. I had heard that, despite arm vascular being very consistent among individuals, it does still vary. And I think for most vaccines I guess it doesn't matter if you hit something other than muscle. Maybe for the mRNA vaccines it does matter? I'm baselessly speculating though. Wish other person hadn't been so vague.
Seems to have been a legitimate, very rare, side effect
https://www.flinders.edu.au/research/articles/covid-vaccine-...