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LiveScience
LiveScience
Stephanie Pappas

Rare clotting effect of early COVID shots finally explained — what could that mean for future vaccines?

An open box of astrazeneca vaccine vials, with one vial pulled out to show the label.

Rare blood clots tied to some early COVID-19 vaccines that are no longer in use may have been the result of two out-of-control immune reactions happening at once.

One of these immune reactions was already known, but the second, reported Oct. 26 in the journal Blood, is a new discovery.

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