"The Last of Us" video game takes zombies to a whole new level with Cordyceps fungus.
The game shows fungus contaminating food, quickly infecting humans & turning them violent.
Real-life Cordyceps fungus infects ants & insects, turning them into "zombies."
HBO series may change elements, but stages of infection will likely stay similar.
The first stage, Runners, is violent with fungal skin lesions.
In the second stage, Stalkers hide & hunt using primitive echolocation.
The third stage, Clickers, use advanced echolocation & has enhanced strength.
The fourth stage, Bloaters, are enormous & can throw mycotoxins.
The infection quickly spreads and causes drastic physical transformations.