When COVID-19 began spreading like wildfire in the Northeast United States this spring, critical care doctor Nuala Meyer could barely believe what she was seeing. “The number of patients who were presenting with critical illness all at the same time was staggering,†remembers Meyer, a professor of medicine at the Hospital of the University of Pennsylvania. But it wasn’t just that these patients were really sick — it was that they were sick in a startling variety of ways.
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