How does herd immunity work?

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Tags

1. #effect
2. #infectious
3. #protection
4. #called
5. #community
6. #measure
7. #indirect
8. #population
9. #occurs
10. #percentage
11. #individuals
12. #large
13. #become
14. #providing
15. #infection
16. #disease
17. #immunity
18. #immune
19. #thereby
20. #social