Apocalyptic Ending

Due to the experiments that the scientist had done, the world has turned into chaos. A chaos that will lead to the extinction of human race. This is a story of a man named Keith Hokins. A man that strive to fight the chaos and to fix the main source of it. It is said to infect both human and animals. It is the survival of the fittest. Hunger, killing, wars are coming. Will the human race be entirely extinct? Or will he be the hope for the new era of the earth.