I'm going to base my facts of a movie called world war Z.
The zombies started of because there was an infections virus that was going around like Ebola. When a zombie bit you it would take 10 seconds to turn you into a zombie.
Some people are brave and die to save their friends. If that was me I would be really scared.
This movie is about what weapon to yous in a zombie apocalypse. I would use a knife.