Vaccinated

Civilization as we once knew it, no longer exists. Mass destruction and chaos have taken over the earth. Rapid X virus has killed almost half of the planet's 7 billion population.
In the meantime a vaccination has been created by a mad scientist out to finish off humanity. Now, one very trusted employee must put a stop to the evil doctor and his plot of elimination. In order to do so, a cat and mouse chase has begun. A race against time to save the remainder of mankind.
Will the demented doctor finish off the world?
Or will his once faithful employee beat him at his own game and end the eradication of human life?
Only time will tell.
But times running out...
Can doomsday be stopped?