This should be another consideration in deciding when to lift the lock downs.
From what I've read most people who survive covid-19 will have no lasting damage. People who become critically ill, however, as Boris did, often incur irreversible damage to the lungs, heart, and nervous system.
Lung function can apparently be reduced by 20-30%, leaving people out of breath after a brisk walk. An athlete, soldier, police officer, or fire fighter so effected could kiss their careers goodbye.