The Walking Dead universe revolves around one terrifying phenomenon — the dead don’t stay dead. They rise and begin hunting the living. This isn’t magic but the result of a global pandemic caused by the Wildfire Virus. This catastrophe wiped out humanity, and its origin, effects, and possible cure remain subjects of great speculation.
How Does the Virus Work?
The most unique aspect of the virus is that it’s airborne and present in every living person, even if they haven’t turned into a zombie yet. It remains dormant in the body until the person dies, at which point it activates and reanimates the corpse. However, what returns isn’t the person but an aggressive, mindless shell.

Zombie bites don’t transmit the virus itself but introduce lethal bacteria into the bloodstream, causing infections that kill the victim within two days.
Is There a Cure?
Many have tried to stop the zombie apocalypse. The Centers for Disease Control (CDC) attempted to develop a vaccine but failed. The only known way to avoid turning into a zombie is through immediate amputation of the infected limb — provided it’s done before the infection spreads. Unfortunately, most victims succumb too quickly for this to be an effective solution.
New Strains and Mutations
Over time, mutated variants of the virus emerged. Some zombies show traces of intelligence, remembering habits from their past lives, opening doors, and even overcoming obstacles. In rare cases, walkers have retained enhanced speed and pack coordination. These variations make survival in The Walking Dead world even more challenging.

Conclusion
The Wildfire Virus is incurable and irreversible, having destroyed civilization and turned the world into a nightmare. The only way to stop a zombie is by destroying its brain. Humanity’s only option is to adapt to the new reality and hope that one day, someone finds a way to defeat the infection.