What we know about the super-rare blood clots linked to the J&J vaccine

Experts are figuring out how to rapidly diagnose and treat the unusual clots linked to both the Johnson & Johnson and AstraZeneca shots.

Published April 14, 2021

8 min read

Scientists are beginning to unravel what is sparking the rare but severe blood clotting reaction that has now been associated with both the Johnson & Johnson and the AstraZeneca coronavirus vaccines.

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What we know about the super-rare blood clots linked to the J&J vaccine

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