What are the three strains of polio?

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Tags

1. #attenuated
2. #vaccine
3. #polio
4. #reference
5. #prepared
6. #poliovirus
7. #mahoney
8. #virulent
9. #serotypes
10. #formalin
11. #inactivation
12. #lansing
13. #saukett
14. #contains
15. #weakened
16. #strains
17. #three
18. #brunenders
19. #inactive