How does the virus start in World War Z?

Related questions

1. Can u play World War Z offline?
2. What is Columbus's real name in Zombieland?
3. How many players is World War Z?
4. Is there going to be World War Z 2?
5. What was the 1st zombie movie?
6. Who made White Zombie?
7. What was the cause of the virus in World War Z?
8. What does the Z stand for in World War Z?
9. What is the release date for World War Z 2?
10. What do the zombies represent in World War Z?

Tags

1. #behavior
2. #first
3. #transmitted
4. #bites
5. #sound
6. #aggressive
7. #believe
8. #sensitive
9. #indeed
10. #changes
11. #experts
12. #through
13. #transplants
14. #movie
15. #highly
16. #which
17. #usually
18. #virus
19. #zombie
20. #rabies
21. #organ
22. #world
23. #animals