Popular game pandemic has conquered the iPhone market. Owned by many people, the game's point is in essence to kill every last human being on earth...but would a disease actually do this? To start, a disease is really only ever as deadly as it needs to be. Virulence, the level of how deadly a disease is is primarily determined by how much a disease needs or doesn't need to spread. The cold for example, has little to no side-effects because it's very easy to spread and gains nothing from hurting you. Something like Ebola would be on the opposite end of the scale. So in theory, if the cold was given to everyone, would it become harmless? Evidence suggests that such has happened in the passed through viruses actually becoming part of our genetic code with up to 8% of our current genome being viruses according to Sharon Moalem in Survival of The Sickest. If a virus were to kill every last human on earth, that would be the end of that virus...
However, there is a flaw in that theory because if a disease were to spread before it could adapt to become less virulent could it actually end itself...? I'd like to hear what all of you guys think.
Also to consider: things that have wiped out mass majorities of people in the past such as the black death.