What causes zombies in World War Z?

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Tags

1. #gorges
2. #scavenging
3. #virus
4. #artifacts
5. #three
6. #likely
7. #patient
8. #flood
9. #however
10. #submerged
11. #basin
12. #river
13. #zombie
14. #young
15. #bitten
16. #chinese
17. #movie
18. #under
19. #caused
20. #water
21. #start
22. #archeological
23. #world