The most horrible disease

[Cocal]

somebody has probably already posted this but its a tie between

A) rabies - make you become mindless zombie killing machine
B) necrotizing fasciitis - eats you from the inside out and only way to stop it is to amputate.

 

[Sick boy]

HIV/Aids easily, you die a slow painful death and it's really easy to obtain, I have two friends who currently suffer from HIV so they still have a very slim chance, but the other two have aids and they're gone

and don't forget super-aids. you can get that just from thinking about kissing someone.
((cookie for refference))

Of course, how could I forget, one teaspoon in your butt and your dead.

 

[RobCoxxy]

Ebola http://www.lmgtfy.com/?q=Ebola+Prognosis

 

[Sneaky-Pie]

Spoiler: Alcoholism

It's a disease.

 

[Ruzzian Roulette]

Any disease that is flesh-eating or necrotizing... *shudder*

http://en.wikipedia.org/wiki/Necrotizing