My dad just got out from a 9 day hospital stay with it on Saturday. 55 years old no other health conditions. He never gets the flu or hardly a cold, but this hit him hard. Was on 15 liters of oxygen for several days and couldn’t move around at all without almost blacking out from his blood oxygen level dropping so low. Dropped 30 pounds from it. He’s doing much better than that now, but still a slow healing process. Small improvements everyday though!