Why don't we get smallpox today?

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Tags

1. #vaccine
2. #infected
3. #laboratories
4. #smallpox
5. #virus
6. #wiped
7. #variola
8. #although
9. #samples
10. #people
11. #infection
12. #because
13. #causes
14. #years
15. #after
16. #becoming
17. #exposure
18. #quickly
19. #saved
20. #would
21. #vaccinated
22. #disease
23. #spread
24. #prevent