Howdy, y'all. I'm looking for an illness that is specifically more fatal to young, otherwise healthy adults than the elderly and infants. Not something they tend to catch because of their behavior, but one that, for some reason, will kill a 20 year old before it'll kill an 80 year old. I'd prefer a virus, but anything is peachy keen.
A friend suggested Spanish Flu, but it dosen't quite fit. I need something that all three (teenage) characters would, at least vaguely, recognize, and that's just a little too obscure. I've done some googling, various combinations of "diseases," "virus," "kids," "young adults" but I don't really know the medical terminology here, either, so I'll take suggestions there, too.