The various CAAs response to this infection is a clear case of closing the stable door after the horse has bolted. The real risk is with pilots with high levels of virus and/or very low immunity. I.e. Those not under monitoring/treatment. Once under treatment and when the immunity is at a safe level the health of a 'patient' is often better than a 'normal' person. The ARVs provide some protection from other viruses like colds & flu. Many 'patients' report less colds/flu or less severe symtoms when on ARVs.