I don't know about you guys, but I think the possibility of such a virus being engineered or coming naturally exists.
I don't think that we need to fear an outbreak of the rage virus anytime soon, but I do think it's technically possible.
"Rage," interestingly enough, is also French for rabies. Rabies is a virus, we all know, that can lead to similar symptoms as the movie infection.
Of course, there are a lot of differences, like the incubation period, (it takes days to weeks to months for symptoms to show), but in many cases, such as the "rage," it is similar.
As a virus, as well, it should be noted that it regularly evolves and changes its outlook, and that's part of the reason that it has been with us for thousands of years.
Technically, I would suppose, all that would be necessary would be a mutation of the virus that would shorten the incubation period of the virus, and/or changed the symptoms to allow the subject to live for a long period of time...
And if it went airborne.....
New, Fast-Evolving Rabies Virus Found -- And SpreadingNew, Fast-Evolving Rabies Virus Found -- And SpreadingOh wow......And rabies is also being used as a possible cure for brain tumors and HIV (
I Am Legend, anyone?)
Or if the Crutzfeldt-Jakob disease ever mutated itself, we could have something similar too.
I just find this all fun and it is interesting to know that real life usually is as interesting as fiction.
Though I wouldn't doubt that the government would have such a disease shelved somewhere for a biological warfare purpose....
Like I said...all highly unlikely, but fun to speculate.