mary fowkes examined more than a hundred people who died from covid.he was stunned by how widespread the destruction was. so, people think of covid as a respiratory illness, but you're seeing damage all over the body. >> dr. fowkes: so, there's damage in the lung, heart, brain, kidney, liver. >> cooper: dr. fowkes told us some of the damage could be caused, in part, by the amped-up immune response, but she also spotted something else. >> dr. fowkes: we saw small and very microscopic blood clots in the lungs, the heart, the liver, and significant blood clots in the brain. >> cooper: is that something you expected to find? >> dr. fowkes: no! ( laughs ) not at all. nobody's seen it like this. >> cooper: blood clots can lead to strokes, which dr. fowkes frequently found in the brains of covid victims. >> dr. fowkes: so, this is the right side of the cerebellum. the cerebellum is responsible for our balance. >> cooper: so, that indentation, that brown wedge? >> dr. fowkes: yup. >> cooper: that's a stroke? >> dr. fowkes: that's a stroke. >> cooper: dr. fowke