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Re:US agencies call for pause in Johnson & Johnson vaccine by lsllc on Tuesday April 13, 2021 @01:01PM (#26795382)
According to this BBC News article, it's 4 per 1M:

https://www.bbc.com/news/health-55302595

Quote:

"The MHRA said about four people in a million would normally be expected to develop this particular kind of blood clot - though the fact they are so rare makes the usual rate hard to estimate."

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