Researchers pinpoint cause of rare but life-threatening blood clots after adenovirus-based COVID vaccination | CIDRAP

Feb 12, 2026

In 2021, just months after the first COVID vaccines debuted, concern was growing about an exceedingly rare but sometimes deadly outcome of certain shots. Two related vaccines—one from AstraZeneca and the other from Johnson & Johnson—were linked to dangerous blood clotting.

https://www.cidrap.umn.edu/covid-19/researchers-pinpoint-cause-rare-life-threatening-blood-clots-after-adenovirus-based-covid