From Newsgroup: sci.misc

Scientists Figured Out the Problem With Johnson & Johnson's COVID
Vaccine

Rare but dangerous blood clotting associated with that vaccine as well
as AstraZeneca's had a genetic cause, according to a new paper.

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.

Out of almost 19 million doses of Johnson & Johnson's version given in
the United States during the first two years of the pandemic, at least
60 such cases were identified. Nine of them were fatal. In the United
Kingdom, where almost 50 million doses of the AstraZeneca shot were
given, 455 cases occurred; 81 people died. In Germany, at least 71
cases were identified, also linked to AstraZeneca. By late spring, use
of both the AstraZeneca and the Johnson & Johnson vaccine was paused,
and ultimately both were pulled from the market. But the mystery
surrounding the rare blood clotting caused by these vaccines lingered.

Now researchers believe they have cracked the case. They have hard
evidence for how the blood clotting happened, and they believe that
their findings could help make similar vaccines even safer.
Understanding the blood-clotting problem is important, they say,
because vaccines of this type could be essential in protecting people
during future pandemics.

https://www.theatlantic.com/science/2026/02/covid-vaccines-blood-clotting-answer/685966/

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