Also we need to remember what the relevant pre-existing conditions here are. I think most people are immediately thinking severe asthma, COPD, recent or curren

Also we need to remember what the relevant pre-existing conditions here are. I think most people are immediately thinking severe asthma, COPD, recent or current cancer treatment; and while all of those elevate your risk, they aren't the most common comorbidities. The key co-morbidities are high blood pressure, heart disease and diabetes. Only heart disease seems obvious - high blood pressure is almost standard, and diabetes is often managed well to the point of invisibility. The cardiac link appears interesting. Patients who are given ECMO, a complete lung bypass alternative to ventilators, have still died after their lungs recovered.