Virus X

Imagine mankind being at its end. No supplies, no medication, no food. No hope. When there was nothing left to do the governments of the world, or what was left of them gave all of the recources left into the search of a Serum. One that would save human kind, cure any desease, grant immortality. Soon humans were tested on potential Serums but soon the scientist realized that the serum was just a dream and the experiments were stopped.
Now, decades later, the state of the world has normalized and the experiments are long forgotten. But suddenly a new threat appears. A Virus among the youth that has its origin in those Experiments. And that creats a completely new problem... a generation of the doomed.