Meat Suit

In the not too distant future, newly developed biotechnology has enabled the creation and production of genetically engineered humanoid bodies that can be remote piloted for use in dangerous work conditions, sports and recreation. Indistinguishable from the normal human by any indicator aside from physical perfection, these avatars are better in every way than a regular human being. They are stronger and faster while being more sensitive to touch and sensation. They were even designed to be immune to all human disease. Because of the avatar’s physical assets, they have been adopted as standard gear by the military and first responders such as police, firefighters and emergency medical technicians. They were thought to be a boon to mankind until what was believed to be a sexually transmitted disease, jumped the species barrier and mutated into an infection that animated sleeping avatars, giving avatars independent mobility and filling them with a cannibalistic urge to feed.
As the infection ravaged the ranks of avatars, turning them, for all intents and purposes, into flesh eating zombies, it became clear that only one group of people were mentally and physically equipped to deal with this new threat. Those people are known as gamers.