Autopsies Indicate Blood Clots Are Lethal in COVID-19

A pathologist describes his observations from examining the bodies of those who succumbed to the coronavirus.

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ABOVE: A blood clot under the microscope
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In mid-March, pathologist Sigurd Lax pulled on a water-repellant surgery coat, a surgical cap, special booties to cover his shoes, a respiratory mask, and two pairs of gloves, then walked into an operating room at Hospital Graz II in Austria. There before him lay a patient who died of COVID-19 only 48 hours earlier.

“COVID-19 is a new disease, and we really want to know what’s underlying it,” Lax says. There’s only one method to determine what causes illness and death. “It’s doing an autopsy.”

Methodically, Lax sliced into the patient, taking care not to spray any bodily fluids into the air. He’d waited two days to perform the autopsy to reduce the risk of transmitting SARS-CoV-2, the coronavirus that causes COVID-19. With little known about the illness at the time, he and his colleagues wanted to take extra precautions to ...

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Meet the Author

  • Ashley Yeager

    Ashley started at The Scientist in 2018. Before joining the staff, she worked as a freelance editor and writer, a writer at the Simons Foundation, and a web producer at Science News, among other positions. She holds a bachelor’s degree in journalism from the University of Tennessee, Knoxville, and a master’s degree in science writing from MIT. Ashley edits the Scientist to Watch and Profile sections of the magazine and writes news, features, and other stories for both online and print.

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