From the back of the book:
The living dead are a nightmare that is deeply ingrained into the human psyche. From alien parasites, to black magic, to engineered viral infections, Outbreak: Undead.. allows you to experience a survival horror sandbox of your own design. ZOMBV, the first entry of the Strain Series, is a world book exploring the Zombic virus, with you and your friends at the center of the story.
Presenting a brand new setting for Outbreak: Undead... 2nd Edition! Take the work out of world design and get focused on the personal stories that make up the heart and soul of your Zombie Survival Simulation.