This is the mechanism:
https://www.nature.com/articles/s41586-021-03744-4
To stop bleeding, platelets get activated by a stuff that gets released near the wound, the activated platelets then aggregate to clots. This activation can get triggered by antibodies that are produced by vaccines. Every additional shot is more dangerous because it can create more antibodies (the immune system has already learned to create them). The platelet activation can get treated with heparin.
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