SaxonRider – Sorry to hear of your loss.
I work as a Critical Care Nurse and unfortunately what happened to you friend is not uncommon.
Obviously without knowing the full details I’m making assumptions, but quite often we see overwise healthly younger people become very unwell when admitted with respiratory infections. Overwise healthly people will ususlly ‘compensate’ for an infection and it’s when this compensatory mechanism reaches its limit that patients suddenly become very ill.
The prognosis is often poor because such patients have often got very little ‘left in the tank’, so to speak, and they can rapidly fall into multi-organ failure.