The European Union's top drug regulator says there is a possible link between the Johnson & Johnson COVID vaccine and very rare blood clots.
At least eight people who got the J&J shot have developed blood clots, but more than 7 million have gotten this vaccine in the U.S.
The European agency says the blood clots should be considered a very rare side effect.
The U.S. paused its use of this vaccine to review it.
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