Not to those that it is already happening too. 10% conditioning to a world class athlete can spell doomsday. There are athletes already compromised, more talking about. these athletes recover from the flu or even play within 24 hours and are 100% in 4 days. This is far more vicious. Blood clotting are really serious and appearing more often plus asthma like breathing issues in some cases that last months.No long term damage likely- that is a way, way out there scenario.