[@Prince of Seraphs] Using "magic" as justification for miracle fixes is in poor taste if there's not a good reason.  =P  The idea here is that, for some reason, magic isn't a suitable option, or is perhaps ineffective.  Maybe because the healer mages are treating the symptoms instead of the actual illness?  *shrugs*

Besides, I'm pretty sure Panther meant IRL.  *shoves Prince*

EDIT: Oh, and getting someone sick by magic is silly, unless it's an attack of some sort.  In which case it's less disease and more either poisoning or germ warfare -- and I really don't think fey have ventured into germ warfare much.