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.

DON'T MISS THE REST OF THIS STORY!

Create a free account to continue and get unlimited access to hundreds of Nat Geo articles, plus newsletters.

Sign Upfor your free account. Or get a Premium Subscription, just $19.SUBSCRIBE

Create your free account to continue reading

No credit card required. Unlimited access to free content.

Or get a Premium Subscription to access the best of Nat Geo - just $19

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

Create your free account to continue reading

Read This Next

Go Further

Animals

Environment

History & Culture

Science

Travel

Subscriber Exclusive Content

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Legal

Our Sites

Join Us

Create your free account to continue reading

Read This Next

Japan poised to release nuclear wastewater into the Pacific

'World’s worst shipwreck' was bloodier than we thought

World’s first ultrasounds of wild manta rays reveal a troubling truth

Titanic was found during secret Cold War Navy mission

Go Further

Animals

Environment

History & Culture

Science

Travel

Subscriber Exclusive Content

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Why are people so dang obsessed with Mars?

How viruses shape our world

The era of greyhound racing in the U.S. is coming to an end

See how people have imagined life on Mars through history

See how NASA’s new Mars rover will explore the red planet

Legal

Our Sites

Join Us

Follow us