Covid has long been recognized as a vascular disease, rather than respiratory. It’s the spike protein that acts as a blood clotting mechanism, causing strokes and heart attacks in people who had experienced no such issues before. (They probably had mechanical timebomb issues, but never realized it.) As the body attempts to fight off the offending spike proteins, it sometimes goes into overdrive. (Cytokine storm that causes massive infection all over- like sepsis.) The lungs are particularly susceptible to this over-response by the immune system, and a frequent effect seen with Covid infection. This fact, and that it is introduced to the body via respiration- makes many get the idea that it’s a respiratory illness. But it is not. It’s vascular, and the lungs and bronchial tubes are some of the easier hit targets once the infection gets circulation via the bloodstream.