Dr. Mary Fowkes, 66, Dies; Helped Science Understand the Pandemic

Dr. Mary Fowkes, a neuropathologist at Mount Sinai Hospital in Manhattan whose autopsies of Covid-19 victims early in the pandemic discovered serious damage in multiple organs — a finding that led to the successful use of higher doses of blood thinners to treat patients — died on Nov. 15 at her home in Katonah, N.Y., in Westchester County. She was 66.

Her daughter, Jackie Treatman, said the cause was a heart attack.

When Dr. Fowkes (rhymes with “pokes”) and her team began their autopsies, little was known about the novel coronavirus, which was believed to be largely a respiratory disease. The first few dozen autopsies revealed that Covid-19 affected the lungs and other vital organs, and that the virus probably traveled through the body in the endothelial cells, which line the interior of blood vessels.

“We saw very small and very microscopic blood clots in the lungs, the heart, the

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