A zombie is caused by a virus like Ebola and the virus that the zombie virus is most alike is Rabies. Because if you get bitten by someone you either die or you get rabies. If you get bit by a zombie you turn in to one of them.
This video is the myth busters showing you what weapons and what strategy is best for a zombie apocalypse. They are trying to find out what is most suitable for a zombie apocalypse and what it would be like to run though a more than 200 hundred people dressed as zombies going 2 miles per our trying to get people running 20 miles per hour.