German scientists claim they have discovered why some coronavirus vaccines cause blood clots — and say jabs could be tweaked to stop the complication.
Two vaccines, one from Johnson & Johnson and the other from Oxford-AstraZeneca have been linked to rare, but serious, blood clots, particularly among women under age 50.
The AstraZeneca vaccine has been linked to 309 clotting cases and 56 deaths in the UK out of 33 million shots, and at least 142 in continental Europe out of 16 million.
As of Wednesday, the J&J vaccine has been linked to 28 cases in the U.S. out of more than 10.4 million shots.
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