> 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

https://www.flinders.edu.au/research/articles/covid-vaccine-...

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tjohns 5 hours ago | parent [-]

It's worth clarifying that the adenovirus-based (viral vector) vaccines that article is discussing were a completely different technology from the mRNA vaccines.

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marcosdumay 3 hours ago | parent [-]

The mRNA vaccines also had a cloth problem (as in, it was extremely rare), that practically disappeared with a change on the application procedure.

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moralestapia 3 hours ago | parent [-]

Can you elaborate? What was the change?

	▲	atomicnumber3 2 hours ago \| parent [-]
		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.